Release v2.14.3.5

The following are the changes in this release: Under macOS, to reduce dependency chains, we remove functions and data that are unreachable by the entry point or exported symbols. In particular, the macOS linker is used with both "-dead_strip" and "-dead_strip_dylibs". The libcalc shared library is now linked with libcustcalc.
remove excess empty line from CHANGES
2025-08-19 01:13:27 +03:00 · 2023-08-17 14:37:50 -07:00 · 2023-08-17 14:30:30 -07:00 · 2023-08-17 14:28:52 -07:00 · 2023-08-17 14:23:29 -07:00 · 2023-08-14 23:09:46 -07:00
32 changed files with 3229 additions and 12581 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -6,26 +6,27 @@
 #
 .dynamic
 .hsrc
-Makefile.our
-NOTES
+.static
 align32.h
 args.h
 cal/.all
 calc
 calc.1
-calc.usage
 calcerr.c
 calcerr.h
+calc.spec
+calc-static
+calc.usage
 charbit.h
 conf.h
-cscript/.all
 cscript/4dsphere
-cscript/README
+cscript/.all
 cscript/fproduct
 cscript/mersenne
 cscript/piforever
 cscript/plus
 cscript/powerterm
+cscript/README
 cscript/simple
 cscript/square
 custom/.all
@@ -67,8 +68,6 @@ have_unused.h
 have_urandom.h
 have_ustat.h
 help/.all
-help/COPYING
-help/COPYING-LGPL
 help/binding
 help/bindings
 help/bug
@@ -78,6 +77,8 @@ help/change
 help/changes
 help/contrib
 help/copy
+help/COPYING
+help/COPYING-LGPL
 help/cscript
 help/custom_cal
 help/errorcode
@@ -98,8 +99,12 @@ libcalc*
 libcustcalc*
 longbits
 longbits.h
+Makefile.our
+NOTES
 sample_many
+sample_many-static
 sample_rand
+sample_rand-static
 tags
 terminal.h
 ver_calc
--- a/121
+++ b/121
@@ -1,4 +1,123 @@
-The following are the changes from calc version 2.14.2.1 to date:
+The following are the changes from calc version 2.14.3.4 to 2.14.3.5:
+
+    Under macOS, to reduce dependency chains, we remove functions
+    and data that are unreachable by the entry point or exported
+    symbols.  In particular, the macOS linker is used with both
+    "-dead_strip" and "-dead_strip_dylibs".
+
+    The libcalc shared library is now linked with libcustcalc.
+
+
+The following are the changes from calc version 2.14.3.0 to 2.14.3.4:
+
+    Fix typo in the `make debug` Makefile rule.
+
+    Improved .gitignore to ignore .static, calc-static,
+    sample_many-static and sample_rand-static.
+
+    Improved error messages when trying to compile with
+    with one calc type (when BLD_TYPE=calc-dynamic-only or
+    BLD_TYPE=calc-static-only) and install with the other.
+
+    When installing with BLD_TYPE=calc-static-only, the
+    installed calc and calc-static are links to each other.
+    Thanks to GitHub user @TurtleWilly for this suggestion.
+
+    The dynamic shared libraries are not installed if they are not
+    built.  So when installing with BLD_TYPE=calc-static-only, the
+    install rule will not attempt to install dynamic shared libraries.
+    Thanks to GitHub user @TurtleWilly for bringing to our attention,
+    problems related to building a statically linked calc under macOS.
+
+    Updated comments in Makefile.local for how to Diagnosing memory,
+    thread, and crash issues under RHEL and macOS.
+
+    We no longer support the Makefile variable ${ALLOW_CUSTOM} to be empty.
+    Normally ${ALLOW_CUSTOM} is:
+
+	ALLOW_CUSTOM= -DCUSTOM
+
+    Now, to disable custom disable custom even if -C is given, use:
+
+	ALLOW_CUSTOM="-UCUSTOM"
+
+    Dropped support of Makefile.simple and custom/Makefile.simple.
+    The calc version 2.14.3.0 is the last release that supported
+    the Makefile.simple and custom/Makefile.simple files.
+    Now, a make that supports makefile conditional syntax is required.
+    The simple target, a target that only was used for Makefile.simple
+    was removed.
+
+    Moved makefile variables that configure calc and configure how to
+    compile calc from Makefile into a new Makefile.config file.
+
+    The Makeifle includes the Makefile.config file.
+    The cal/Makeifle includes the Makefile.config file.
+    The cscript/Makeifle includes the Makefile.config file.
+    The custom/Makeifle includes the Makefile.config file.
+    The help/Makeifle includes the Makefile.config file.
+
+    Now, the Makefile.config file will consistently configure
+    calc and how calc is compiled and built by all calc Makefiles.
+    The custom/Makefile no longer includes Makefile.
+
+    The platform target section from the old Makefile has been moved
+    to a new file, Makefile.target.  Improved the format and comments
+    in target information.
+
+    The Makeifle includes the Makefile.target file.
+    The cal/Makeifle includes the Makefile.target file.
+    The cscript/Makeifle includes the Makefile.target file.
+    The custom/Makeifle includes the Makefile.target file.
+    The help/Makeifle includes the Makefile.target file.
+
+    Now, the Makefile.target file will consistently set
+    target information for all calc Makefiles.
+
+    The cal/Makeifle includes the Makefile.local file.
+    The cscript/Makeifle includes the Makefile.local file.
+    The custom/Makeifle includes the Makefile.local file.
+    The help/Makeifle includes the Makefile.local file.
+
+    Thus, one may modify or append many Makefile variables
+    in all calc Makefiles.
+
+    Removed the ${CAL_PASSDOWN}, ${HELP_PASSDOWN}, ${HELP_PASSDOWN},
+    ${CSCRIPT_PASSDOWN} Makefile variables as the new Makefile
+    include files keep Makefile variables in sync.
+
+    Fixed the ability of calc to compile when CUSTOM is undefined
+    (i.e., -UCUSTOM).  The libcustcalc is always built, regardless
+    of the $(ALLOW_CUSTOM} Makefile variable.  However when CUSTOM
+    is undefined, the bulk of custom functions are not defined.
+
+    Dropped the use of Makefile variable ${SET_INSTALL_NAME}.
+    Under macOS it was always needed, elsewhere it was not.
+
+    Added Makefile variable ${VER} to hold the calc major release version.
+    The calc major release version is a 3 level version (x.y.z).
+
+    Under macOS, the current version of both libcalc and libcustcalc
+    shared libraries are set to the current calc major release version.
+
+    Under macOS, to reduce dependency chains, we remove functions and
+    data that are unreachable by the entry point or exported symbols.
+    In particular, the macOS linker is used with "-dead_strip" by default.
+
+    While calc on macOS will execute if linker used with "-dead_strip_dylibs"
+    and CUSTOM is defined, other applications that use libcalc but not
+    libcustcalc (such as sample_many and sample_rand) will fail to execute
+    due to missile symbols.  Therefore "-dead_strip_dylibs" is not used
+    by default when ALLOW_CUSTOM is "-DCUSTOM" under macOS.
+    Thanks to GitHub user @TurtleWilly for bringing to our attention,
+    problems related to use of  "-dead_strip_dylibs".
+
+    When installing shared libraries, libcalc.x.y.z will be a link
+    to the libcalc shared library and libcustcalc.x.y.z will be a link
+    to the libcustcal shared library.
+
+
+The following are the changes from calc version 2.14.2.1 to 2.14.3.0:

    Added cal/fnv_tool.cal, a calc resource file defining:

--- a/HOWTO.INSTALL
+++ b/HOWTO.INSTALL
@@ -1,495 +1,390 @@
+# Installing a pre-compiled calc from an RPM

-IMPORTANT: Please see the section at the bottom of this file for
-	   some important information on Makefiles used in calc.
+If your platform supports RPMs, you may want to go to:

-###################################################################
-# IMPORTANT: DO NOT use make in parallel mode!!!		  #
-###################################################################
-# Unfortunately due to the complex dependency issues between	  #
-# Makefile, Makefile.ship and custom/Makefile, parallel make      #
-# is NOT recommended.  Sorry (tm Canada) :)			  #
-###################################################################
+    https://github.com/lcn2/calc/releases

-Installing calc from the bzip2-ed tarball: 4 easy steps:
+and see if there is a pre-compiled version of calc that you may install.

-    (0) If your platform supports i686 RPMs, you may want to go to:
+Open up the 'Assets' tag below a given release and download these RPMs:

-	    https://github.com/lcn2/calc/releases
+    * calc*.rpm

-	Open up the 'Assets' tag below a given release and
-	download these RPMs:
+	- all that is needed if you just want to use calc

-	    * calc*.i686.rpm
-		- all that is needed if you just want to use calc
+If your platform supports rpm and matches one of the "calc*.rpm" files, you
+may just install that "calc*.rpm".  For exammple on an x86_64 system:

-	    * calc-devel-*.i686.rpm
-	        - calc *.h header and *.a lib files for use in other programs
+    dnf install calc-x.y.z.cv-ww.x86_64.rpm

-	    * calc.*.src.rpm
-	        - calc source via a SRPM package
+where "calc-x.y.z.cv-ww.x86_64.rpm" is the name of the calc RPM.

-	Alternately to the above github link, you might try looking at
-	the RPMs under:
+In addition, if your platform supports rpm and matches one of the
+"calc*.rpm" files, you may also install the calc *.h header and *.a lib
+files for use in other programs:

-	    http://www.isthe.com/chongo/src/calc/
+    * calc-devel-*.rpm

-=-=
+	- calc *.h header and *.a lib files for use in other programs

-The following 4 steps apply to calc source tree that comes from either:
+Alternately to the above github link, you might try looking at the RPMs under:

-	bunzip2 -c calc-*.tar.bz2 | tar -xvf -
+    http://www.isthe.com/chongo/src/calc/

-or from:

-	rpm -ivh calc-*.src.rpm
-	cd /var/tmp
-	bunzip2 -c /usr/src/redhat/SOURCES/calc-*.tar.bz2 | tar -xvf -
-
-4 steps:
-
-(1)	Look at the makefile, and adjust it to suit your needs.
-
-	The top level Makefile and the custom/Makefile require a modern
-	Make (such as gmake) or an equivalently advanced make.	On many
-	targets, the default make is sufficient.  On FreeBSD for example,
-	probably want to use gmake instead of make.
-
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-	! By default, calc assumes you have the readline package installed !
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-	! macOS does not have readline, so mac users need to make a choice !
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-	The readline package (-lreadline, -lhistory, -lncurses) used by and
-	linked into calc by default.  If your system does NOT have those
-	libaraies, then you have two options:
-
-	(1-with readline) Install the readline package 		<- Recommended
-
-	    Install the readline package first, then compile calc.
-
-	    For information on the readline package, see:
-
-		https://tiswww.case.edu/php/chet/readline/rltop.html
-
-	    MacOS users can use MacPorts or HomeBrew to install readline:
-
-		https://www.macports.org
-		https://brew.sh
-
-	    Or compile from the readline.git repo:
-
-		http://git.savannah.gnu.org/cgit/readline.git/
-
-	(1-w/o readline) Compile calc without readline 	(not recommended)
-
-	    Why do we not recommend (1b)?  Because using calc with readline
-	    provides a beter user experience.
-
-	    If you feel you must use calc without the readline package, then you
-	    will need to change your calc Makefile with this patch:
-
--- Makefile.old	2021-12-29 14:57:56.000000000 -0800
-+++ Makefile	2021-12-29 14:59:13.000000000 -0800
-@@ -1140,14 +1140,14 @@
- #
- # If in doubt, set USE_READLINE, READLINE_LIB and READLINE_INCLUDE to nothing.
- #
-#USE_READLINE=
-USE_READLINE= -DUSE_READLINE
-+USE_READLINE=
-+#USE_READLINE= -DUSE_READLINE
- #
-#READLINE_LIB=
-#READLINE_EXTRAS=
-+READLINE_LIB=
-+READLINE_EXTRAS=
- #
-READLINE_LIB= -lreadline
-READLINE_EXTRAS= -lhistory -lncurses
-+#READLINE_LIB= -lreadline
-+#READLINE_EXTRAS= -lhistory -lncurses
- #
- #READLINE_LIB= -L/usr/gnu/lib -lreadline
- #READLINE_EXTRAS= -lhistory -lncurses
-@@ -1181,8 +1181,8 @@
- # # and using the readline, history, and ncurses libraries.
- # #
- ifneq ($(HOMEBREW_PREFIX),)
-READLINE_LIB:= -L${HOMEBREW_PREFIX}/opt/readline/lib -lreadline
-READLINE_INCLUDE:= -I${HOMEBREW_PREFIX}/opt/readline/include
-+#READLINE_LIB:= -L${HOMEBREW_PREFIX}/opt/readline/lib -lreadline
-+#READLINE_INCLUDE:= -I${HOMEBREW_PREFIX}/opt/readline/include
- endif
- #
- #endif  /* end of skip for non-Gnu makefiles */
-
-	    If your target system does not have a modern Makefile
-	    (such as gmake), then you will need to change your
-	    Makefile.simple with this patch:
-
--- Makefile.simple.orig	2021-12-29 15:00:53.000000000 -0800
-+++ Makefile.simple	2021-12-29 15:01:00.000000000 -0800
-@@ -1005,14 +1005,14 @@
- #
- # If in doubt, set USE_READLINE, READLINE_LIB and READLINE_INCLUDE to nothing.
- #
-#USE_READLINE=
-USE_READLINE= -DUSE_READLINE
-+USE_READLINE=
-+#USE_READLINE= -DUSE_READLINE
- #
-#READLINE_LIB=
-#READLINE_EXTRAS=
-+READLINE_LIB=
-+READLINE_EXTRAS=
- #
-READLINE_LIB= -lreadline
-READLINE_EXTRAS= -lhistory -lncurses
-+#READLINE_LIB= -lreadline
-+#READLINE_EXTRAS= -lhistory -lncurses
- #
- #READLINE_LIB= -L/usr/gnu/lib -lreadline
- #READLINE_EXTRAS= -lhistory -lncurses
-
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-	! By default, calc assumes you are using a modern gnu-like make tool !
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-	If your target system does not have a modern Makefile (such as gmake),
-	then you should try using the Makefile.simple and custom/Makefile.simple
-	files:
-
-	    mv Makefile Makefile.gmake
-	    cp Makefile.simple Makefile
-	    mv custom/Makefile custom/Makefile.gmake
-	    cp custom/Makefile.simple custom/Makefile
-
-	The Makefile, as shipped, is suitable for installation under
-	Linux and Un*x-like environments.  For the most part, the default
-	values should work.  If in doubt, follow the 'When in doubt'
-	suggestion.
-
-	If you are using a modern make (such as gmake), you may override
-	any values set in the Makefile by adding them to Makefile.local
-	using the := directive.  For example:
-
-	    HAVE_STRING_H:= YES
-	    HAVE_TIMES_H:= YES
-	    SED:= /usr/local/bin/nsed
-
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-	! If you are building under Windows or a Windows-like environment !
-	! (such as Cygwin or DJGPP), read the README.WINDOWS file.        !
-	!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-	You should determine if these Makefile variables are reasonable:
-
-	    INCDIR		Where the system include (.h) files are kept.
-	    BINDIR		Where to install calc binary files.
-	    LIBDIR		Where to install calc link library (*.a) files.
-	    CALC_SHAREDIR	Where to install calc help, .cal, startup, and
-				config files.
-
-	You may want to change the default installation locations for
-	these values, which are based on the 4 values listed above:
-
-	    HELPDIR            where the help directory is installed
-	    CALC_INCDIR        where the calc include files are installed
-	    CUSTOMCALDIR       where custom *.cal files are installed
-	    CUSTOMHELPDIR      where custom help files are installed
-	    CUSTOMINCDIR       where custom .h files are installed
-	    SCRIPTDIR          where calc shell scripts are installed
-
-	If you want to install calc files under a top level directory,
-	then set the T value:
-
-	    The calc install is performed under ${T}, the calc build is
-	    performed under /.	The purpose for ${T} is to allow someone
-	    to install calc somewhere other than into the system area.
-
-	    For example, if:
-
-		BINDIR= /usr/bin
-		LIBDIR= /usr/lib
-		CALC_SHAREDIR= /usr/share/calc

-	    and if:
+# Building calc from a source tree

-		T= /var/tmp/testing

-	    Then the installation locations will be:

-		calc binary files:	/var/tmp/testing/usr/bin
-		calc link library:	/var/tmp/testing/usr/lib
-		calc help, .cal ...:	/var/tmp/testing/usr/share/calc
-		... etc ...		/var/tmp/testing/...
+## Step 0: Obtain the calc source tree

-	    If ${T} is empty, calc is installed under /, which is the same
-	    top of tree for which it was built.  If ${T} is non-empty, then
-	    calc is installed under ${T}, as if one had to chroot under
-	    ${T} for calc to operate.
+Go to the site:

-	Look for the section that starts:
+    https://github.com/lcn2/calc/releases

-	    ################
-	    # compiler set #
-	    ################
+Look for release with a file of the form:

-	    Select a compiler set by commenting in the appropriate set
-	    of cc options.  As shipped the Makefile assumes a gcc-like
-	    environment such as Linux.  If a more appropriate cc set if
-	    found below, comment out the Linux set and comment in that
-	    set or edit the gcc set or the common cc set as needed.
+    calc-x.y.z.v.tar.bz2

-	You may want to change these Makefile variables from their defaults:
+A release marked with a green "(Latest)" is a production release
+that as undergone a fair amount of testing.

-	    RANLIB
+A release marked with an orange "(Pre-release)" is likly to be
+more stable than the top of the master branch, as they do undergo
+thru a reasonable level of regression testing, just not to
+the level of a  "(Latest)" production release.

-		You may or may not need RANLIB when building libraries.
-		As shipped the Makefile assumes RANLIB is needed.
-		Comment the in/out the RANLIB value if ranlib does
-		not work or does not exist.
+Use the followig command to uncompress the bzip2 compressed tarball:

-	    CALCPAGER
+    bunzip2 -c calc-*.tar.bz2 | tar -xvf -

-		You may want to change the default pager used by calc.
-		As shipped the Makefile assumes 'more'.  On your system
-		you may find 'less' to be a better pager.
+NOTE: An alternate location for calc bzip2 compressed tarballs is:

-	    DEBUG
+    http://www.isthe.com/chongo/src/calc/

-	       Some compilers (to put it mildly) have bugs.  Sometimes the
-	       DEBUG Makefile variable causes the compiler / optimizer to
-	       produce bad code.  Other compilers do just fine.

-	       If possible try to use DEBUG=-O3 -g3 (maximum optimization
-	       and debug symbols).  If the calc test fails (see step 3),
-	       try lowering either the -O value and/or the -g3.  Also try
-	       using -Osomething without -g.

-	   Adjust other Makefile variables as needed.
+### Obtaining the experimental top of the master branch calc source

-    (2)	build calc:
+You may also fetch the top of the master branch of the GitHub repo
+if you wish to see what the latest source code looks like:

-	The top level Makefile and the custom/Makefile require a GNU
-	Make (such as gmake) or an equivalently advanced make.	On many
-	targets, the default make is sufficient.  On FreeBSD for example,
-	one must use gmake instead of make.
+    git clone https://github.com/lcn2/calc.git

-	If your target system does not have GNU Make (or equivalent), then
-	you should try using the Makefile.simple and custom/Makefile.simple
-	files:
+IMPORTANT:

-	    mv Makefile Makefile.gmake
-	    cp Makefile.simple Makefile
-	    mv custom/Makefile custom/Makefile.gmake
-	    cp custom/Makefile.simple custom/Makefile
+The latest source code may be "experimental in nature".   You may be
+better off using a released bzip2 compressed tarball instead.
+Released bzip2 compressed tarballs tend to be more well tested
+than the top of the master branch.

-	make all

-	==> We are interested in any compiler warnings (and errors) that
-	    you may find.  See the BUGS file if you find any compiler
-	    warning or errors.

-	NOTE: You can force calc to build with only static libs:
+## Step 1: Makefile considerations

-		make clobber
-		make calc-static-only BLD_TYPE=calc-static-only

-	      or force calc to build with only dynamic libs:
+### IMPORTANT: Make support of conditional syntax required:

-		make clobber
-		make calc-dynamic-only BLD_TYPE=calc-dynamic-only
+To compile calc, you must use a make that supports the use of
+"Conditional syntax".  As nearly all modern make tools
+support "Conditional syntax", thus should not be a problem
+for you.  If for some reason your make tool does not support
+"Conditional syntax", consider upgraded to a make that does,
+such as the Gnu Make tool:

-    (3)	test calc:
+    https://www.gnu.org/software/make/

-	    make check
+The Gnu Make is not required per-se, just a modern make tool
+that supports "Conditional syntax".

-	NOTE: For a quiet check which only prints if something goes wrong:

-	    make chk
+### Review Makefiles

-    (4)	install calc:
+Review Makefile.config and Makefile.target.

-	    make install
+If you are curious, review Makefile as well, although
+there may be little in the main Makefile that you may
+want to change.
+
+Consider modifying Makefile.local by replace values or
+appending values found in Makefile.config and Makefile.target.
+
+If you are adding custom functions, review custom/Makefile
+and modify custom/Makefile as needed.
+
+
+
+### Suggestion: Modify Makefile.local
+
+All Makefiles include Makefile.local just before the
+first and default all rule.  So Makefile.local may be
+used to modify, replace or append values to Makefile variables.
+
+In most cases, to change the way that calc is made, consider
+adding lines to Makefile.local instead of modifying other Makefiles.
+
+A recommended way to adjust it is to add lines to: Makefile.local
+using the := syntax to replace values such as:
+
+    DEBUG:= -O0 -g
+
+or by using the += syntax to append to values such as:
+
+    DEBUG+= -ipa
+
+You can, of course, modify other Makefiles.  We only
+suggest using Makefile.local to minimize the number
+of source files you modify.
+
+And finally, you can always just add arguments to your
+make command line instead of modifying a Makefile.  For example:
+
+    make clobber all DEBUG="-O0 -g"
+
+
+## readline package assumed by default:
+
+By "readline package" we refer to the combination of the
+readline library, the history library, and the ncurses library.
+
+By default, calc assumes you have the readline package installed.
+The readline package (-lreadline, -lhistory, -lncurses) used by and
+linked into calc by default.
+
+If your system (such as macOS) does NOT have those libaraies, then
+you have two options:
+
+
+
+### Install the readline package:
+
+We recommend that you install the readline package first, then compile calc.
+
+For information on the readline package, see:
+
+    https://tiswww.case.edu/php/chet/readline/rltop.html
+
+MacOS users can use MacPorts or HomeBrew to install readline:
+
+    https://www.macports.org
+    https://brew.sh
+
+Or compile from the readline.git repo:
+
+    http://git.savannah.gnu.org/cgit/readline.git/
+
+
+
+### Compile calc without readline:
+
+Why do we not recommend this option because using calc with readline
+provides a beter user experience.
+
+If you feel you must use calc without the readline package, then you
+will need to compile with:
+
+    make clobber all USE_READLINE= READLINE_EXTRAS= READLINE_INCLUDE= READLINE_LIB=
+
+or add to Makefile.local, these lines:
+
+    USE_READLINE=
+    READLINE_EXTRAS=
+    READLINE_INCLUDE=
+    READLINE_LIB=
+
+See the "Suggestion: Modify Makefile.local" section above for
+information on the Makefile.local file.
+
+
+### Windows or a Windows-like environments:
+
+Currently Windows is not a well supported platform for calc.  There are
+people within Microsoft who plan to assist us in being able to allow
+the standard Microsoft Windows developor environment to compile calc.
+
+
+
+### Makefile variables to consider:
+
+You should determine if these Makefile variables are reasonable:
+
+    INCDIR		Where the system include (.h) files are kept.
+    BINDIR		Where to install calc binary files.
+    LIBDIR		Where to install calc link library (*.a) files.
+    CALC_SHAREDIR	Where to install calc help, .cal, startup, and config files.
+
+You may want to change the default installation locations for
+these values, which are based on the 4 values listed above:
+
+    HELPDIR            where the help directory is installed
+    CALC_INCDIR        where the calc include files are installed
+    CUSTOMCALDIR       where custom *.cal files are installed
+    CUSTOMHELPDIR      where custom help files are installed
+    CUSTOMINCDIR       where custom .h files are installed
+    SCRIPTDIR          where calc shell scripts are installed
+
+If you want to install calc files under a top level directory, then set the T value:
+
+    The calc install is performed under ${T}, the calc build is
+    performed under /.	The purpose for ${T} is to allow someone
+    to install calc somewhere other than into the system area.
+
+    For example, if:
+
+	BINDIR= /usr/bin
+	LIBDIR= /usr/lib
+	CALC_SHAREDIR= /usr/share/calc
+
+    and if:
+
+	T= /var/tmp/testing
+
+    Then the installation locations will be:
+
+	calc binary files:	/var/tmp/testing/usr/bin
+	calc link library:	/var/tmp/testing/usr/lib
+	calc help, .cal ...:	/var/tmp/testing/usr/share/calc
+	... etc ...		/var/tmp/testing/...
+
+    If ${T} is empty, calc is installed under /, which is the same
+    top of tree for which it was built.  If ${T} is non-empty, then
+    calc is installed under ${T}, as if one had to chroot under
+    ${T} for calc to operate.
+
+Again, consider adding replacement lines or append linbes to
+the Makefile.local file.  See "Suggestion Modify Makefile.local
+instead of Makefile" above.  For example:
+
+    T:= /var/tmp/testing
+
+See the "Suggestion: Modify Makefile.local" section above for
+information on the Makefile.local file.
+
+
+### platform target section
+
+The file, Makefile.target, contains information about various platforms.
+The current list of targets in Makefile.target are:
+
+- Linux target
+- Apple macOS / Darwin target
+- FreeBSD target
+- OpenBSD target
+- Cygwin target
+- simple target
+- default target (when target is empty)
+
+If you wish to modiy your target platform, consider doing
+so via the Makefile.local file.  See "Suggestion Modify Makefile.local
+instead of Makefile" above.
+
+
+
+## Step 2: compile calc
+
+Remove any previous compile attempts and compile by default:
+
+    make clobber all
+
+
+
+### Force calc to build with only static libs:
+
+You may force calc to build with only static libs:
+
+    make clobber calc-static-only BLD_TYPE=calc-static-only
+
+
+
+### Force calc to build with only dynamic shared libs:
+
+You may force calc to build with only dynamic libs:
+
+    make clobber calc-dynamic-only BLD_TYPE=calc-dynamic-only
+
+
+
+### Reports of compiler warnings (and errors) as welcome
+
+We are interested learning about any compiler warnings (and errors) that you may find.
+See the BUGS file if you find any compiler warning or errors.
+
+
+
+### Step 3: test calc
+
+You may run the calc regression test suite, after successfully compiling, by:
+
+    make check
+
+For a more quiet check which only prints if something goes wrong, use:
+
+    make chk
+
+
+
+### Step 4: install calc
+
+Depending on permissions, you may need to become the super-user:
+
+    sudo -s
+
+before you install:
+
+    make install
+
+
+
+### Step n: calc help - getting started
+
+Calc is distributed with an extensive collection of help files that
+are accessible from the command line.  The following assume that you
+are running calc from the distribution directory or that you have
+installed calc.	 In these examples, the "; " is the calc prompt, not
+something that you type.
+
+For list of help topics:
+
+    ; help
+
+For overview of calc overview:
+
+    ; help intro
+    ; help overview
+    ; help command
+    ; help define
+    ; help statement
+    ; help variable
+    ; help usage
+
+For list of builtin functions:
+
+    ; help builtin
+
+C programmers should note some unexpected differences with the calc syntax:
+
+    ; help unexpected
+
+Calc is shipped with a standard collection of calc resource files.
+For a list of calc standard resource files see:
+
+    ; help resource

 We suggest that you might want to read the README.FIRST file and look at
 the calc help subsystem.  See also the README.md file.

-In general, if you run into problems, read the BUGS file and follow
-the instructions.
+In general, if you run into problems, read the BUGS file and follow the instructions.

-=-=
+# IMPORTANT: parallel make not supported

-On calc Makefiles:
+We do not support making calc using a parallel make as most parallel
+make systems fail to understand the depedency relationships between
+a numner of important make rules and thus fail to properly compile calc.

-How to tell the origin of of a Makefile:

-    The "# SRC: ... - ..." comment line near the top
-    of the file indicates the origin of this file.
-    In each segment below, we indicate what the SRC
-    comment like will read.

-SHELL= ...
-
-    On some systems, /bin/sh is a rather reduced shell with
-    deprecated behavior.
-
-    If your system has a up to date, bash shell, then
-    you may wish to edit the Makefile to use:
-
-	    SHELL= /bin/bash
-
-    On some systems such as macOS, the bash shell is very
-    far behind to the point where is cannot be depended on.
-    On such systems, the sh may be a much better alternative
-    shell for this Makefile to use:
-
-	    SHELL= /bin/sh
-
-Makefile.local
-
-    # SRC: Makefile.local - tweaks to the top level Makefile
-
-    Between releases, Makefile.local at the top of the master branch
-    will contain how we typically build calc and test calc (FYI: we
-    normally enable things such as -Werror -Wextra -pedantic).  When we
-    push out a release, Makefile.local will be stripped of non-comment
-    lines.  Thus, releases of calc, and, released "calc*.src.rpm"
-    files and the source tarballs, will have a Makefile.local with
-    only comments.
-
-    If the Makefile is not suitable for you (say because you fetch it
-    from the top of the master branch between releases), then you may
-    wish to remove all non-comment lines.  I.e., lines that do not start
-    with the # character.
-
-    This Makefile.local assumes you have a modern make command such as
-    the GNU make.  See Makefile.simple comment below if you do not
-    have such a modern make command.
-
-    In the calc GitHub repo, Makefile is the calc build environment
-    and Makefile.ship is the top level Makefile:
-
-	https://github.com/lcn2/calc
-
-Makefile
-
-    # SRC: Makefile.ship - top level Makefile
-
-    This is the main top level Makefile.
-
-    In calc packages such as RPMs, and the tar.bz2 source tarball,
-    Makefile.ship has been moved into Makefile.
-
-    In the calc GitHub repo, Makefile is the calc build environment
-    and Makefile.ship is the top level Makefile:
-
-	https://github.com/lcn2/calc
-
-    The Makefile.simple rule of Makefile.ship, when forming the
-    Makefile.simple file, removes lines from Makefile.ship between
-    pairs of '#if 0' AND '#endif':
-
-	#if 0
-	lines removed when forming Makefile.simple
-	...
-	lines removed when forming Makefile.simple
-	#endif
-
-    The '#if 0' AND '#endif' MUST be at the start of the line.
-    Any text after the '#if 0' OR '#endif' is ignored.
-
-    While they may look like a CPP directives, they are not.  The
-    inline awk script of the Makefile.simple rule does NOT allow
-    them to nest:
-
-	#if 0 /* DO NOT DO THIS */
-	lines removed when forming Makefile.simple
-	...
-	#if 0 /* DO NOT DO THIS */
-	...
-	#endif /* DO NOT DO THIS */
-	...
-	#endif /* DO NOT DO THIS */
-
-Makefile.simple
-
-    # SRC: Makefile.simple - non-GNU version
-
-    This is a non-GNU or simple Makefile designed for environments
-    that do not have a modern make command.
-
-    If you have a Makefile.simple file, use these commands to
-    form a Makefile:
-
-	if [ -f Makefile ]; then mv -f Makefile Makefile.orig; fi
-	cp Makefile.simple Makefile
-
-    The Makefile.simple rule from Makefile.ship is used to construct
-    this file from the contents of Makefile.ship.
-
-    In calc packages such as RPMs, and the tar.bz2 source the
-    Makefile.simple exists.  In the calc GitHub repo:
-
-	https://github.com/lcn2/calc
-
-    this file does NOT exist and must be made via the Makefile.simple
-    make rule.  Therefore, non-GNU and simple make commands are NOT
-    supported by the calc GitHub repo master branch.  Instead, you
-    need to extract Makefile.simple from one of the calc tar.bz2
-    source tarball source from a calc source mirror:
-
-	http://www.isthe.com/chongo/tech/comp/calc/calc-mirror.html
-
-custom/Makefile
-
-    # SRC: Makefile via make -f Makefile custom/Makefile
-
-    This is the custom directory Makefile.
-
-custom/Makefile.simple
-
-    # SRC: custom/Makefile.simple - non-GNU version
-
-    This is a non-GNU or simple Makefile for the custom directory
-    that is designed for environments that do not have a modern make
-    command.
-
-    In calc packages such as RPMs, and the tar.bz2 source the
-    Makefile.simple exists.  In the calc GitHub repo:
-
-	https://github.com/lcn2/calc
-
-    this file does NOT exist and must be made via the
-    custom/Makefile.simple make rule.  Therefore, non-GNU and simple
-    make commands are NOT supported by the calc GitHub repo master
-    branch.  Instead, you need to extract custom/Makefile.simple
-    from one of the calc tar.bz2 source tarball source from a calc
-    source mirror:
-
-	http://www.isthe.com/chongo/tech/comp/calc/calc-mirror.html
-
-cal/Makefile
-
-    # SRC: cal/Makefile
-
-    The Makefile for the cal sub-directory.
-
-cscript/Makefile
-
-    # SRC: cscript/Makefile
-
-    The Makefile for the cscript sub-directory.
-
-help/Makefile
-
-    # SRC: help/Makefile
-
-    The Makefile for the help sub-directory.
-
-## Copyright (C) 1999-2007,2021  Landon Curt Noll
+## Copyright (C) 1999-2007,2021,2023  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/2965
+++ b/2965
--- a/Makefile.config
+++ b/Makefile.config
--- a/Makefile.local
+++ b/Makefile.local
@@ -1,14 +1,44 @@
 #!/usr/bin/env make
 #
-# Makefile.local - local Makefile variables
+# Makefile.local - modify, replace or append calc Makefile variables
 #
-# This file is included by Makefile after the last Makefile is set and
-# before the first make rule.  This makes this file suitable to override
-# Makefile variables.
+# Copyright (C) 2023  Landon Curt Noll
+#
+# Suggestion: Read the HOWTO.INSTALL file.
+#
+# Calc is open software; you can redistribute it and/or modify it under
+# the terms of version 2.1 of the GNU Lesser General Public License
+# as published by the Free Software Foundation.
+#
+# Calc is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
+# Public License for more details.
+#
+# A copy of version 2.1 of the GNU Lesser General Public License is
+# distributed with calc under the filename COPYING-LGPL.  You should have
+# received a copy with calc; if not, write to Free Software Foundation, Inc.
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+#
+# This calculator first developed by David I. Bell with help/mods from others.
+#
+# chongo <was here> /\oo/\	http://www.isthe.com/chongo/
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/
+
+####
+# This file is included all calc Makefiles after the last Makefile variable
+# is set and before the first make rule.  This makes this file suitable to
+# modify, replace or append Makefile variables.
 #
 # To replace a Makefile variable, use := symbols.  For example:
 #
 #	CCWERR:= -Werror
+#
+# You can append to an existing Makefile variable using '+=' symbols.
+# For example:
+#
+#	CFLAGS+= -Ofast
+####

 ###################################################################
 # NOTE: For this and other commended out examples in this file,	  #
@@ -17,24 +47,65 @@
 # Comments start with a #-character.				  #
 ###################################################################

-# You can append to an existing Makefile variable using '+=' symbols.
-# For example:
+####
+# RHEL Diagnosing memory, thread, and crash issues:
 #
-#	CFLAGS+= -Ofast
+# For more info see: https://github.com/google/sanitizers/wiki/AddressSanitizer
+#
+# This comment block was tested under:
+#
+#	RHEL9 gcc version 11.3.1 20221121 (Red Hat 11.3.1-4) (GCC)
+#
+# with:
+#
+#	libasan-11.3.1-4.3.el9.x86_64 libubsan-11.3.1-4.3.el9.x86_64
+#
+# NOTE: With the above version, these are NOT supported:
+#
+#    UNSUPPORTED_FSANITIZE:= -fsanitize=nullability-arg -fsanitize=nullability-assign
+#
+# Uncomment these lines:
+#
+# DEBUG:= -O0 -g
+# FSANITIZE:= -fsanitize=undefined -fsanitize=address -fsanitize=bool -fsanitize=bounds
+# FSANITIZE+= -fsanitize=enum -fsanitize=vptr -fsanitize=integer-divide-by-zero
+# FSANITIZE+= -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow
+# FSANITIZE+= -fsanitize=nonnull-attribute -fsanitize=returns-nonnull-attribute
+# FSANITIZE+= -fsanitize=null -fsanitize=shift -fsanitize=signed-integer-overflow
+# FSANITIZE+= -fsanitize=unreachable -fsanitize=vla-bound
+# CFLAGS+= -Wno-invalid-command-line-argument ${FSANITIZE} -fno-omit-frame-pointer
+# LDFLAGS+= -Wno-invalid-command-line-argument ${FSANITIZE} -fno-omit-frame-pointer
+# CALC_ENV+= ASAN_OPTIONS=detect_stack_use_after_return=1
+####

-# For example, a AddressSanitizer.  You do NOT want to do this by
-# by default!  Do this only if you are debugging with libasan:
+####
+# macOS Diagnosing memory, thread, and crash issues:
 #
-# For Linux gcc version 11.3.1 with libasan-11.3.1-2.1 you might try:
+# For more info see: https://github.com/google/sanitizers/wiki/AddressSanitizer
 #
-#	DEBUG:= -O0 -g
-#	CFLAGS+= -fsanitize=address -fno-omit-frame-pointer
-#	LDFLAGS+= -fsanitize=address -fno-omit-frame-pointer
-#	CALC_ENV+= ASAN_OPTIONS=detect_stack_use_after_return=1
+# This comment block was tested under:
 #
-# For macOS 13.2.1 with clang version 14.0.0 (clang-1400.0.29.202) you might try:
+#	macOS 13.5 with clang version 14.0.3 (clang-1403.0.22.14.1)
 #
-#	DEBUG:= -O0 -g
-#	CFLAGS+= -fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined
-#	LDFLAGS+= -fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined
-#	CALC_ENV+= ASAN_OPTIONS=detect_stack_use_after_return=1
+# For more info for clang to Diagnosing memory, thread, and crash issues early, see:
+#
+#    https://developer.apple.com/documentation/xcode/diagnosing-memory-thread-and-crash-issues-early
+#
+# NOTE: With the above version, these are NOT supported:
+#
+#    UNSUPPORTED_FSANITIZE:= -fsanitize-nullability-return
+#
+# Uncomment these lines:
+#
+# DEBUG:= -O0 -g
+# FSANITIZE:= -fsanitize=undefined -fsanitize=address -fsanitize=bool -fsanitize=bounds
+# FSANITIZE+= -fsanitize=enum -fsanitize=vptr -fsanitize=integer-divide-by-zero
+# FSANITIZE+= -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow
+# FSANITIZE+= -fsanitize=nonnull-attribute -fsanitize=nullability-arg
+# FSANITIZE+= -fsanitize=nullability-assign -fsanitize=returns-nonnull-attribute
+# FSANITIZE+= -fsanitize=null -fsanitize=object-size -fsanitize=shift
+# FSANITIZE+= -fsanitize=signed-integer-overflow -fsanitize=unreachable -fsanitize=vla-bound
+# CFLAGS+= -Wno-invalid-command-line-argument ${FSANITIZE} -fno-omit-frame-pointer
+# LDFLAGS+= -Wno-invalid-command-line-argument ${FSANITIZE} -fno-omit-frame-pointer
+# CALC_ENV+= ASAN_OPTIONS=detect_stack_use_after_return=1
+####
--- a/Makefile.simple
+++ b/Makefile.simple
--- a/Makefile.target
+++ b/Makefile.target
@@ -0,0 +1,432 @@
+#!/usr/bin/env make
+#
+# Makefile.target - platform target section
+#
+# Copyright (C) 2023  Landon Curt Noll
+#
+# Suggestion: Read the HOWTO.INSTALL file.
+#
+# Calc is open software; you can redistribute it and/or modify it under
+# the terms of version 2.1 of the GNU Lesser General Public License
+# as published by the Free Software Foundation.
+#
+# Calc is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
+# Public License for more details.
+#
+# A copy of version 2.1 of the GNU Lesser General Public License is
+# distributed with calc under the filename COPYING-LGPL.  You should have
+# received a copy with calc; if not, write to Free Software Foundation, Inc.
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+#
+# This calculator first developed by David I. Bell with help/mods from others.
+#
+# chongo <was here> /\oo/\	http://www.isthe.com/chongo/
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/
+
+
+# SUGGESTION: Instead of modifying this file, consider adding
+#	      statements to modify, replace or append Makefile
+#	      variables in the Makefile.local file.
+
+
+#######################################################################
+# NOTE: These lines are included by both Makefile and custom/Makefile #
+#######################################################################
+
+##################################################################################
+#-=-=-=-=-=- platform target section - targets that override defaults -=-=-=-=-=-#
+##################################################################################
+
+# Common values set in targets
+#
+# BLD_TYPE determines if calc is built with static and/or dynamic libs.
+#	       Set this value to one of:
+#
+#	BLD_TYPE= calc-dynamic-only
+#	BLD_TYPE= calc-static-only
+#
+# CC_SHARE are flags given to ${CC} to build .o files suitable for shared libs
+# DEFAULT_LIB_INSTALL_PATH is where calc programs look for calc shared libs
+# LD_SHARE are common flags given to ${CC} to link with shared libraries
+# LIBCALC_SHLIB are flags given to ${CC} to build libcalc shared libraries
+# LIBCUSTCALC_SHLIB are flags given to ${CC} to build libcustcalc shared lib
+#
+#	NOTE: The above 5 values are unused if BLD_TYPE= calc-static-only
+#
+# CC_STATIC are flags given to ${CC} to build .o files suitable for static libs
+# LD_STATIC are common flags given to ${CC} to link with static libraries
+# LIBCALC_STATIC are flags given to ${CC} to build libcalc static libraries
+# LIBCUSTCALC_STATIC are flags given to ${CC} to build libcustcalc static lib
+#
+#	NOTE: The above 4 values are unused if BLD_TYPE= calc-dynamic-only
+#
+# CCOPT are flags given to ${CC} for optimization
+# CCWARN are flags given to ${CC} for warning message control
+#
+# The following are given to ${CC}:
+#
+#	WNO_IMPLICT
+#	WNO_ERROR_LONG_LONG
+#	WNO_LONG_LONG
+#
+# when compiling special .o files that may need special compile options:
+#
+#	NOTE: These flags simply turn off certain compiler warnings,
+#	      which is useful only when CCWERR is set to -Werror.
+#
+#	NOTE: If your compiler does not have these -Wno files, just
+#	      set these variables to nothing as in:
+#
+#		WNO_IMPLICT=
+#		WNO_ERROR_LONG_LONG=
+#		WNO_LONG_LONG=
+#
+# CCWERR are flags given to ${CC} to make warnings fatal errors
+#	NOTE: CCWERR is only set in development Makefiles and must only be
+#	      used with ${CC}, not ${LCC}.  If you do not want the compiler
+#	      to abort on warnings, then leave CCWERR blank.
+# CCMISC are misc flags given to ${CC}
+#
+# CCBAN is given to ${CC} in order to control if banned.h is in effect.
+#	NOTE: See where CCBAN is defined above for details.
+#
+# LCC is how the C compiler is invoked on locally executed intermediate programs
+# CC is how the C compiler is invoked (with an optional Purify)
+#
+# Specific target overrides or modifications to default values
+
+
+################
+# Linux target #
+################
+
+ifeq ($(target),Linux)
+
+# default build type for this target
+#
+BLD_TYPE= calc-dynamic-only
+
+# target specific library parameters
+#
+CC_SHARE= -fPIC
+DEFAULT_LIB_INSTALL_PATH= ${PWD}:/lib:/usr/lib:${LIBDIR}:${PREFIX}/lib
+LD_SHARE= "-Wl,-rpath,${DEFAULT_LIB_INSTALL_PATH}" \
+    "-Wl,-rpath-link,${DEFAULT_LIB_INSTALL_PATH}"
+LIBCALC_SHLIB= -shared "-Wl,-soname,libcalc${LIB_EXT_VERSION}"
+LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
+
+# static library option
+#
+CC_STATIC=
+LD_STATIC=
+LIBCALC_STATIC=
+LIBCUSTCALC_STATIC=
+
+# common values set for this target
+#
+#CCWARN= -Wall
+CCWARN= -Wall -Wextra -pedantic
+WNO_IMPLICT= -Wno-implicit
+WNO_ERROR_LONG_LONG= -Wno-error=long-long
+WNO_LONG_LONG= -Wno-long-long
+CCWERR=
+CCOPT= ${DEBUG}
+CCMISC=
+LCC= gcc
+CC= ${PURIFY} ${LCC} ${CCWERR}
+
+endif	# ($(target),Linux)
+
+
+###############################
+# Apple macOS / Darwin target #
+###############################
+
+ifeq ($(target),Darwin)
+
+# default build type for this target
+#
+BLD_TYPE= calc-dynamic-only
+
+# For old Apple Power PC systems, we need to add:
+#
+#	-std=gnu99 -arch ppc
+#
+ifeq ($(arch),powerpc)
+COMMON_ADD+= -std=gnu99
+ARCH_CFLAGS+= -arch ppc
+endif	# ($(arch),powerpc)
+
+# target specific library parameters
+#
+CC_SHARE= -fPIC
+DEFAULT_LIB_INSTALL_PATH= ${PWD}:${LIBDIR}:${PREFIX}/lib
+LD_SHARE= ${ARCH_CFLAGS}
+LIBCALC_SHLIB= -dynamiclib -undefined dynamic_lookup \
+    -install_name ${LIBDIR}/libcalc${LIB_EXT_VERSION} \
+    -current_version ${VER} \
+    ${ARCH_CFLAGS}
+LIBCUSTCALC_SHLIB= -dynamiclib -undefined dynamic_lookup \
+    -install_name ${LIBDIR}/libcustcalc${LIB_EXT_VERSION} \
+    -current_version ${VER} \
+    ${ARCH_CFLAGS}
+
+# To reduce dependency chains under macOS, we remove functions and
+# data that are unreachable by the entry point or exported symbols.
+#
+COMMON_LDFLAGS+= -Wl,-dead_strip
+COMMON_LDFLAGS+= -Wl,-dead_strip_dylibs
+
+# static library option
+#
+CC_STATIC=
+LD_STATIC= ${ARCH_CFLAGS}
+LIBCALC_STATIC=
+LIBCUSTCALC_STATIC=
+
+# common values set for this target
+#
+#CCWARN= -Wall
+CCWARN= -Wall -Wextra -pedantic
+WNO_IMPLICT= -Wno-implicit
+WNO_ERROR_LONG_LONG= -Wno-error=long-long
+WNO_LONG_LONG= -Wno-long-long
+CCWERR=
+CCOPT= ${DEBUG}
+CCMISC= ${ARCH_CFLAGS}
+LCC= cc
+CC= ${PURIFY} ${LCC} ${CCWERR}
+
+# Darwin dynamic shared lib filenames
+#
+LIB_EXT:= .dylib
+LIB_EXT_VERSION:= .${VERSION}${LIB_EXT}
+
+# LDCONFIG not required on this platform, so we redefine it to an empty string
+#
+LDCONFIG:=
+
+endif	# ($(target),Darwin)
+
+
+##################
+# FreeBSD target #
+##################
+
+ifeq ($(target),FreeBSD)
+
+# default build type for this target
+#
+BLD_TYPE= calc-dynamic-only
+
+# target specific library parameters
+#
+CC_SHARE= -fPIC
+DEFAULT_LIB_INSTALL_PATH= ${PWD}:/lib:/usr/lib:${LIBDIR}:${PREFIX}/lib
+LD_SHARE= "-Wl,-rpath,${DEFAULT_LIB_INSTALL_PATH}" \
+    "-Wl,-rpath-link,${DEFAULT_LIB_INSTALL_PATH}"
+LIBCALC_SHLIB= -shared "-Wl,-soname,libcalc${LIB_EXT_VERSION}"
+LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
+
+CC_STATIC=
+LD_STATIC=
+LIBCALC_STATIC=
+LIBCUSTCALC_STATIC=
+
+# common values set for this target
+#
+#CCWARN= -Wall
+CCWARN= -Wall -Wextra -pedantic
+WNO_IMPLICT= -Wno-implicit
+WNO_ERROR_LONG_LONG= -Wno-error=long-long
+WNO_LONG_LONG= -Wno-long-long
+CCWERR=
+CCOPT= ${DEBUG}
+CCMISC=
+LCC= gcc
+CC= ${PURIFY} ${LCC} ${CCWERR}
+
+# We must use gmake as the FreeBSD target because under some older
+# releases of FreeBSD, make not support conditional syntax.
+#
+MAKE= gmake
+
+endif	# ($(target),FreeBSD)
+
+
+##################
+# OpenBSD target #
+##################
+
+ifeq ($(target),OpenBSD)
+
+# default build type for this target
+#
+BLD_TYPE= calc-dynamic-only
+
+# default build type for this target
+#
+CC_SHARE= -fPIC
+DEFAULT_LIB_INSTALL_PATH= ${PWD}:/lib:/usr/lib:${LIBDIR}:${PREFIX}/lib
+LD_SHARE= "-Wl,-rpath,${DEFAULT_LIB_INSTALL_PATH}" \
+    "-Wl,-rpath-link,${DEFAULT_LIB_INSTALL_PATH}"
+LIBCALC_SHLIB= -shared "-Wl,-soname,libcalc${LIB_EXT_VERSION}"
+LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
+
+# static library option
+#
+CC_STATIC=
+LD_STATIC=
+LIBCALC_STATIC=
+LIBCUSTCALC_STATIC=
+
+# common values set for this target
+#
+#CCWARN= -Wall
+CCWARN= -Wall -Wextra -pedantic
+WNO_IMPLICT= -Wno-implicit
+WNO_ERROR_LONG_LONG= -Wno-error=long-long
+WNO_LONG_LONG= -Wno-long-long
+CCWERR=
+CCOPT= ${DEBUG}
+CCMISC=
+#
+LCC= gcc
+CC= ${PURIFY} ${LCC} ${CCWERR}
+#
+MAKE= gmake
+#
+endif	# ($(target),OpenBSD)
+
+
+#################
+# Cygwin target #
+#################
+
+ifeq ($(target),Cygwin)
+
+BLD_TYPE= calc-static-only
+
+# target specific library parameters
+#
+CC_SHARE= -fPIC
+DEFAULT_LIB_INSTALL_PATH= ${PWD}:/lib:/usr/lib:${LIBDIR}:${PREFIX}/lib
+LD_SHARE= "-Wl,-rpath,${DEFAULT_LIB_INSTALL_PATH}" \
+    "-Wl,-rpath-link,${DEFAULT_LIB_INSTALL_PATH}"
+LIBCALC_SHLIB= -shared "-Wl,-soname,libcalc${LIB_EXT_VERSION}"
+LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
+
+# static library option
+#
+CC_STATIC=
+LIBCALC_STATIC=
+LIBCUSTCALC_STATIC=
+LD_STATIC=
+
+# common values set for this target
+#
+#CCWARN= -Wall
+CCWARN= -Wall -Wextra -pedantic
+WNO_IMPLICT= -Wno-implicit
+WNO_ERROR_LONG_LONG= -Wno-error=long-long
+WNO_LONG_LONG= -Wno-long-long
+CCWERR=
+CCOPT= ${DEBUG}
+CCMISC=
+LCC= cc
+CC= ${PURIFY} ${LCC} ${CCWERR}
+
+endif	# ($(target),Cygwin)
+
+
+###########################################
+# default target - (when target is empty) #
+###########################################
+
+# NOTE: This is the default generic host target.  Used when no other
+#	host target matches.
+
+ifeq ($(target),)
+
+# default build type for this target
+#
+BLD_TYPE= calc-static-only
+
+# target specific library parameters
+#
+CC_SHARE= -fPIC
+DEFAULT_LIB_INSTALL_PATH= ${PWD}:/lib:/usr/lib:${LIBDIR}:${PREFIX}/lib
+LD_SHARE= "-Wl,-rpath,${DEFAULT_LIB_INSTALL_PATH}" \
+    "-Wl,-rpath-link,${DEFAULT_LIB_INSTALL_PATH}"
+LIBCALC_SHLIB= -shared "-Wl,-soname,libcalc${LIB_EXT_VERSION}"
+LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
+
+# static library option
+#
+CC_STATIC=
+LIBCALC_STATIC=
+LIBCUSTCALC_STATIC=
+LD_STATIC=
+
+# common values set for this target
+#
+#CCWARN= -Wall
+CCWARN= -Wall -Wextra -pedantic
+WNO_IMPLICT= -Wno-implicit
+WNO_ERROR_LONG_LONG= -Wno-error=long-long
+WNO_LONG_LONG= -Wno-long-long
+CCWERR=
+CCOPT= ${DEBUG}
+CCMISC=
+LCC= gcc
+CC= ${PURIFY} ${LCC} ${CCWERR}
+
+endif	# ($(target),)
+
+
+###########################################
+# Set the default compile flags for ${CC} #
+###########################################
+
+# If you want to add flags to all compiler and linker
+# run (via ${COMMON_CFLAGS} and ${COMMON_LDFLAGS}),
+# set ${COMMON_ADD}.
+#
+# For example to use gcc's -Werror to force warnings
+# to become errors, call make with:
+#
+#   make .. COMMON_ADD='-Werror'
+#
+# This facility requires a Gnu Makefile, or a make command
+# that understands the += make operand.
+#
+COMMON_CFLAGS+= ${COMMON_ADD}
+COMMON_LDFLAGS+= ${COMMON_ADD}
+
+# Required flags to compile C files for calc
+#
+# ICFLAGS are given to ${CC} for intermediate programs used to help compile calc
+# CFLAGS are given to ${CC} for calc programs other than intermediate programs
+#
+# NOTE: This does not work for: make-XYZ-only and BLD_TYPE != make-XYZ-only
+#
+ifeq ($(BLD_TYPE),calc-static-only)
+ICFLAGS= ${COMMON_CFLAGS} ${CCBAN} ${CC_STATIC}
+else	# ($(BLD_TYPE),calc-static-only)
+ICFLAGS= ${COMMON_CFLAGS} ${CCBAN} ${CC_SHARE}
+endif	# ($(BLD_TYPE),calc-static-only)
+CFLAGS= ${ICFLAGS} ${CCOPT}
+
+# Required flags to link files for calc
+#
+# ILDFLAGS for ${CC} in linking intermediate programs used to help compile calc
+# LDFLAGS for ${CC} in linking calc programs other than intermediate programs
+#
+ILDFLAGS= ${COMMON_LDFLAGS}
+LDFLAGS= ${LD_DEBUG} ${ILDFLAGS}
+
+#######################################################################
+#-=-=-=-=-=- end of target section - only make rules below -=-=-=-=-=-#
+#######################################################################
--- a/README.FIRST
+++ b/README.FIRST
@@ -27,7 +27,7 @@ If you run into problems, see the BUGS file.
 Calc is distributed with an extensive collection of help files that
 are accessible from the command line.  The following assume that you
 are running calc from the distribution directory or that you have
-installed calc.	 In these examples, the ">" is the calc prompt, not
+installed calc.	 In these examples, the "; " is the calc prompt, not
 something that you type in.

 For list of help topics:
@@ -48,7 +48,7 @@ For list of builtin functions:

    ; help builtin

-C programmers should note some unexpected differences in the calc syntax:
+C programmers should note some unexpected differences with the calc syntax:

    ; help unexpected

--- a/cal/Makefile
+++ b/cal/Makefile
@@ -4,13 +4,7 @@
 #
 # Copyright (C) 1999-2006,2017,2021-2023  Landon Curt Noll
 #
-# SRC: cal/Makefile
-#
-#	The "# SRC: ... - ..." comment line above indicates
-#	the origin of this file.
-#
-# IMPORTANT: Please see the section on Makefiles near the
-#	     bottom of the HOWTO.INSTALL file.
+# Suggestion: Read the ../HOWTO.INSTALL file.
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -29,184 +23,64 @@
 # Under source code control:	1991/07/21 05:00:54
 # File existed as early as:	1991
 #
+# This calculator first developed by David I. Bell with help/mods from others.
+#
 # chongo <was here> /\oo/\	http://www.isthe.com/chongo/
-# Share and enjoy!  :-) http://www.isthe.com/chongo/tech/comp/calc/
-#
-# calculator by David I. Bell with help/mods from others
-# Makefile by Landon Curt Noll
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/


-# The shell used by this Makefile
-#
-# On some systems, /bin/sh is a rather reduced shell with
-# deprecated behavior.
-#
-# If your system has a up to date, bash shell, then
-# you may wish to use:
-#
-#	SHELL= bash
-#
-# On some systems such as macOS, the bash shell is very
-# far behind to the point where is cannot be depended on.
-# On such systems, the sh may be a much better alternative
-# shell for this Makefile to use:
-#
-#	SHELL= sh
-#
-SHELL= bash
-#SHELL= sh
-#if 0	/* start of skip for non-Gnu makefiles */
-#
-ifeq ($(target),Darwin)
-SHELL:= /bin/sh
-endif
-#endif	/* end of skip for non-Gnu makefiles */
+# SUGGESTION: Instead of modifying this file, consider adding
+#	      statements to modify, replace or append Makefile
+#	      variables in the ../Makefile.local file.


-####
-# Normally, the upper level makefile will set these values.  We provide
-# a default here just in case you want to build from this directory.
-####
-
-# PREFIX - Top level location for calc
-#
-# The PREFIX is often prepended to paths within calc and calc Makefiles.
-#
-# Starting with calc v2.13.0.1, nearly all Makefile places that used
-# /usr/local now use ${PREFIX}.  An exception is the olduninstall rule
-# and, of course, this section. :-)
-#
-# NOTE: The ${PREFIX} is not the same as ${T}.  The ${T} specifies
-#	a top level directory under which calc installs things.
-#	While usually ${T} is empty, it can be specific path
-#	as if calc where "chrooted" during an install.
-#	The ${PREFIX} value, during install, is a path between
-#	the top level ${T} install directory and the object
-#	such as an include file.
-#
-# NOTE: See also, ${T}, below.
-#
-# There are some paths that do NOT call under ${PREFIX}, such as
-# ${CALCPATH}, that include paths not under ${PREFIX}, but those
-# too are exceptions to this general rule.
-#
-# When in doubt, try:
-#
-#	PREFIX= /usr/local
-#
-PREFIX= /usr/local
-#PREFIX= /usr
-#PREFIX= /usr/global
+###########################################
+# Files used or included by this Makefile #
+###########################################

 # Normally certain files depend on the Makefile.  If the Makefile is
 # changed, then certain steps should be redone.  If MAKE_FILE is
 # set to Makefile, then these files will depend on Makefile.  If
-# MAKE_FILE is empty, then they wont.
+# MAKE_FILE is empty, then they won't.
 #
 # If in doubt, set MAKE_FILE to Makefile
 #
 MAKE_FILE= Makefile

-# Where the system include (.h) files are kept
-#
-# For DJGPP, select:
-#
-#	INCDIR= /dev/env/DJDIR/include
-#
-# If in doubt, set:
-#
-#	INCDIR= /usr/include
+# Calc configuration and compile configuration values
 #
+CONFIG_MKF= ../Makefile.config

-#INCDIR= ${PREFIX}/include
-#INCDIR= /dev/env/DJDIR/include
-INCDIR= /usr/include
+# Host target information.
+#
+TARGET_MKF= ../Makefile.target

-# where to install calc related things
+# Local file that is included just prior to the first rule,
+# that allows one to override any values set in this Makefile.
 #
-# ${BINDIR}		where to install calc binary files
-# ${LIBDIR}		where calc link library (*.a) files are installed
-# ${CALC_SHAREDIR}	where to install calc help, .cal, startup, config files
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# For DJGPP, select:
-#
-#	BINDIR= /dev/env/DJDIR/bin
-#	LIBDIR= /dev/env/DJDIR/lib
-#	CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-#
-# If in doubt, set:
-#
-#	BINDIR= /usr/bin
-#	LIBDIR= /usr/lib
-#	CALC_SHAREDIR= /usr/share/calc
-#
-#BINDIR= ${PREFIX}/bin
-#BINDIR= /dev/env/DJDIR/bin
-BINDIR= /usr/bin
+LOCAL_MKF= ../Makefile.local

-#LIBDIR= ${PREFIX}/lib
-#LIBDIR= /dev/env/DJDIR/lib
-LIBDIR= /usr/lib
+# The set of Makefiles
+#
+MK_SET= ${MAKE_FILE} ${CONFIG_MKF} ${TARGET_MKF} ${LOCAL_MKF}

-#CALC_SHAREDIR= ${PREFIX}/lib/calc
-#CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-CALC_SHAREDIR= /usr/share/calc

-# By default, these values are based CALC_SHAREDIR, INCDIR, BINDIR
-# ---------------------------------------------------------------
-# ${HELPDIR}		where the help directory is installed
-# ${CALC_INCDIR}	where the calc include files are installed
-# ${SCRIPTDIR}		where calc shell scripts are installed
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# If in doubt, set:
-#
-#	HELPDIR= ${CALC_SHAREDIR}/help
-#	CALC_INCDIR= ${INCDIR}/calc
-#	SCRIPTDIR= ${BINDIR}/cscript
-#
-HELPDIR= ${CALC_SHAREDIR}/help
-CALC_INCDIR= ${INCDIR}/calc
-SCRIPTDIR= ${BINDIR}/cscript
+#######################################################
+# Calc configuration and compile configuration values #
+#######################################################
+include ${CONFIG_MKF}
+
+
+###############################
+# host target section include #
+###############################
+include ${TARGET_MKF}
+
+
+##########################################################################
+#=-=-=-=-=- Be careful if you change something below this line -=-=-=-=-=#
+##########################################################################

-# T - top level directory under which calc will be installed
-#
-# The calc install is performed under ${T}, the calc build is
-# performed under /.	The purpose for ${T} is to allow someone
-# to install calc somewhere other than into the system area.
-#
-# For example, if:
-#
-#     BINDIR= /usr/bin
-#     LIBDIR= /usr/lib
-#     CALC_SHAREDIR= /usr/share/calc
-#
-# and if:
-#
-#     T= /var/tmp/testing
-#
-# Then the installation locations will be:
-#
-#     calc binary files:	/var/tmp/testing/usr/bin
-#     calc link library:	/var/tmp/testing/usr/lib
-#     calc help, .cal ...:	/var/tmp/testing/usr/share/calc
-#     ... etc ...		/var/tmp/testing/...
-#
-# If ${T} is empty, calc is installed under /, which is the same
-# top of tree for which it was built.  If ${T} is non-empty, then
-# calc is installed under ${T}, as if one had to chroot under
-# ${T} for calc to operate.
-#
-# If in doubt, use T=
-#
-T=

 # Makefile debug
 #
@@ -240,22 +114,6 @@ H=@
 V=@:
 #V=@

-# standard tools
-#
-CHMOD= chmod
-CMP= cmp
-CO= co
-CP= cp
-FMT= fmt
-MKDIR= mkdir
-MV= mv
-RM= rm
-RMDIR= rmdir
-SED= sed
-SORT= sort
-TOUCH= touch
-TRUE= true
-
 # The calc files to install
 #
 # This list is produced by the detaillist rule when no WARNINGS are detected.
@@ -300,8 +158,24 @@ CALCLIBLIST=
 #
 PHONY= all clobber distlist install

+
+############################################################
+# Allow Makefile.local to change any of the above settings #
+############################################################
+include ${LOCAL_MKF}
+
+
+###########################################
+# all - First and default Makefile target #
+###########################################
+
 all: ${CALC_FILES} ${MAKE_FILE} .all

+
+###############################
+# additional Makefile targets #
+###############################
+
 # used by the upper level Makefile to determine of we have done all
 #
 .all:
--- a/calc.c
+++ b/calc.c
@@ -164,9 +164,31 @@ main(int argc, char **argv)
 				switch (c) {
 				case 'C':
 #if defined(CUSTOM)
+
+					/*
+					 * error if libcustcalc was compiled with CUSTOM undefined
+					 */
+					if (custom_compiled() == 0) {
+					    fprintf(stderr, "%s: calc was built with custom functions enabled, "
+							    "however custom_compiled() retuned 0", program);
+					    exit(1);
+					}
+
+					/*
+					 * indicate that custom functions are now allowed
+					 */
 					allow_custom = TRUE;
 					break;
 #else /* CUSTOM */
+
+					/*
+					 * error if libcustcalc was compiled with CUSTOM defined
+					 */
+					if (custom_compiled() == 1) {
+					    fprintf(stderr, "%s: calc was built with custom functions disabled, "
+							    "however custom_compiled() retuned 1", program);
+					}
+
 					/*
 					 * we are too early in processing to
 					 * call libcalc_call_me_last() -
--- a/calc.spec.in
+++ b/calc.spec.in
@@ -1,7 +1,7 @@
 #
 # calc.spec.in - template specfile for calc
 #
-# Copyright (C) 2003-2014,2021  Petteri Kettunen and Landon Curt Noll
+# Copyright (C) 2003-2014,2021,2023  Petteri Kettunen and Landon Curt Noll
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -20,23 +20,25 @@
 # Under source code control:	2003/02/16 20:21:39
 # File existed as early as:	2003
 #
-# calculator by David I. Bell with help/mods from others
-# Makefile by Petteri Kettunen with modifications from Landon Curt Noll
+# This calculator first developed by David I. Bell with help/mods from others.
+#
+# chongo <was here> /\oo/\	http://www.isthe.com/chongo/
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/

 # BUGS
 #  - Uninstalling calc and calc-devel leaves empty dirs /usr/include/calc
-#    and /usr/share/calc and its subdirs. In case e.g. %{_includedir}/calc
+#    and /usr/share/calc and its subdirs. In case e.g., _includedir/calc
 #    is defined in `files devel' section, then rpmbuild complains that
 #    header files are defined twice - rpmbuild bug or bug in specfile conf???

 Summary: Arbitrary precision calculator.
 Name: calc
 Version: <<<PROJECT_VERSION>>>
-Release: 13
+Release: 14
 License: LGPL
 Group: Applications/Engineering
-Source: http://www.isthe.com/chongo/src/calc/%{name}-%{version}.tar.bz2
-URL: http://www.isthe.com/chongo/tech/comp/calc/index.html
+Source: https://github.com/lcn2/calc/releases/download/v<<<PROJECT_VERSION>>>/%{name}-%{version}.tar.bz2
+URL: https://github.com/lcn2/calc
 Vendor: Landon Noll and Associates
 Packager: Landon Noll and Associates (http://www.isthe.com/chongo/index.html)
 Requires: ncurses >= 5.5-24, readline >= 5.1-3, less >= 358
@@ -51,7 +53,11 @@ calculator, an algorithm prototype and mathematical research
 tool. Calc comes with a rich set of builtin mathematical and
 programming functions.

-For the latest calc release, see the calc project home page:
+For the latest calc release, see the calc GitHub repo:
+
+    https://github.com/lcn2/calc
+
+or the calc home page:

    http://www.isthe.com/chongo/tech/comp/calc/index.html

@@ -67,7 +73,11 @@ Requires: ncurses >= 5.5-24, readline >= 5.1-3, less >= 358
 This package contains the header files and static libraries for developing
 calc (arbitrary precision calculator).

-For the latest calc release, see the project home page:
+For the latest calc release, see the calc GitHub repo:
+
+    https://github.com/lcn2/calc
+
+or the calc home page:

    http://www.isthe.com/chongo/tech/comp/calc/index.html

@@ -152,8 +162,10 @@ echo '-=- calc.spec beginning make clean -=-'
 %attr(644, root, root) %{_datadir}/%{name}/*.cal
 %attr(644, root, root) %{_datadir}/%{name}/set8700.line
 %attr(644, root, root) %{_libdir}/libcalc.so
+%attr(644, root, root) %{_libdir}/libcalc.so.<<<PROJECT_VER>>>
 %attr(644, root, root) %{_libdir}/libcalc.so.%{version}
 %attr(644, root, root) %{_libdir}/libcustcalc.so
+%attr(644, root, root) %{_libdir}/libcustcalc.so.<<<PROJECT_VER>>>
 %attr(644, root, root) %{_libdir}/libcustcalc.so.%{version}

 %files devel
@@ -165,6 +177,11 @@ echo '-=- calc.spec beginning make clean -=-'
 %attr(644, root, root) %{_libdir}/libcustcalc.a

 %changelog
+* Mon Aug 14 2023 Landon Curt Noll http://www.isthe.com/chongo
+- Release: 14
+- Use Source and URL based on calc GitHub repo URLs.
+- Install dynamic shared libraries with 3-digit version numbers.
+
 * Sun Mar 24 2019 Landon Curt Noll http://www.isthe.com/chongo
 - Release: 13
 - Disable compiling with the default ARCH_CFLAGS= -march=native
--- a/cscript/Makefile
+++ b/cscript/Makefile
@@ -4,13 +4,7 @@
 #
 # Copyright (C) 1999-2006,2014,2017,2021-2023  Landon Curt Noll
 #
-# SRC: cscript/Makefile
-#
-#	The "# SRC: ... - ..." comment line above indicates
-#	the origin of this file.
-#
-# IMPORTANT: Please see the section on Makefiles near the
-#	     bottom of the HOWTO.INSTALL file.
+# Suggestion: Read the ../HOWTO.INSTALL file.
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -29,184 +23,63 @@
 # Under source code control:	1999/11/29 11:10:26
 # File existed as early as:	1999
 #
+# This calculator first developed by David I. Bell with help/mods from others.
+#
 # chongo <was here> /\oo/\	http://www.isthe.com/chongo/
-# Share and enjoy!  :-) http://www.isthe.com/chongo/tech/comp/calc/
-#
-# calculator by David I. Bell with help/mods from others
-# Makefile by Landon Curt Noll
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/


-# The shell used by this Makefile
-#
-# On some systems, /bin/sh is a rather reduced shell with
-# deprecated behavior.
-#
-# If your system has a up to date, bash shell, then
-# you may wish to use:
-#
-#	SHELL= bash
-#
-# On some systems such as macOS, the bash shell is very
-# far behind to the point where is cannot be depended on.
-# On such systems, the sh may be a much better alternative
-# shell for this Makefile to use:
-#
-#	SHELL= sh
-#
-SHELL= bash
-#SHELL= sh
-#if 0	/* start of skip for non-Gnu makefiles */
-#
-ifeq ($(target),Darwin)
-SHELL:= /bin/sh
-endif
-#endif	/* end of skip for non-Gnu makefiles */
+# SUGGESTION: Instead of modifying this file, consider adding
+#	      statements to modify, replace or append Makefile
+#	      variables in the ../Makefile.local file.


-####
-# Normally, the upper level makefile will set these values.  We provide
-# a default here just in case you want to build from this directory.
-####
-
-# PREFIX - Top level location for calc
-#
-# The PREFIX is often prepended to paths within calc and calc Makefiles.
-#
-# Starting with calc v2.13.0.1, nearly all Makefile places that used
-# /usr/local now use ${PREFIX}.  An exception is the olduninstall rule
-# and, of course, this section. :-)
-#
-# NOTE: The ${PREFIX} is not the same as ${T}.  The ${T} specifies
-#	a top level directory under which calc installs things.
-#	While usually ${T} is empty, it can be specific path
-#	as if calc where "chrooted" during an install.
-#	The ${PREFIX} value, during install, is a path between
-#	the top level ${T} install directory and the object
-#	such as an include file.
-#
-# NOTE: See also, ${T}, below.
-#
-# There are some paths that do NOT call under ${PREFIX}, such as
-# ${CALCPATH}, that include paths not under ${PREFIX}, but those
-# too are exceptions to this general rule.
-#
-# When in doubt, try:
-#
-#	PREFIX= /usr/local
-#
-PREFIX= /usr/local
-#PREFIX= /usr
-#PREFIX= /usr/global
+###########################################
+# Files used or included by this Makefile #
+###########################################

 # Normally certain files depend on the Makefile.  If the Makefile is
 # changed, then certain steps should be redone.  If MAKE_FILE is
 # set to Makefile, then these files will depend on Makefile.  If
-# MAKE_FILE is empty, then they wont.
+# MAKE_FILE is empty, then they won't.
 #
 # If in doubt, set MAKE_FILE to Makefile
 #
 MAKE_FILE= Makefile

-# Where the system include (.h) files are kept
-#
-# For DJGPP, select:
-#
-#	INCDIR= /dev/env/DJDIR/include
-#
-# If in doubt, set:
-#
-#	INCDIR= /usr/include
+# Calc configuration and compile configuration values
 #
+CONFIG_MKF= ../Makefile.config

-#INCDIR= ${PREFIX}/include
-#INCDIR= /dev/env/DJDIR/include
-INCDIR= /usr/include
+# Host targets that are shared in common with both Makefile
+# and custom/Makefile.
+#
+TARGET_MKF= ../Makefile.target

-# where to install calc related things
+# Host target information.
 #
-# ${BINDIR}		where to install calc binary files
-# ${LIBDIR}		where calc link library (*.a) files are installed
-# ${CALC_SHAREDIR}	where to install calc help, .cal, startup, config files
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# For DJGPP, select:
-#
-#	BINDIR= /dev/env/DJDIR/bin
-#	LIBDIR= /dev/env/DJDIR/lib
-#	CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-#
-# If in doubt, set:
-#
-#	BINDIR= /usr/bin
-#	LIBDIR= /usr/lib
-#	CALC_SHAREDIR= /usr/share/calc
-#
-#BINDIR= ${PREFIX}/bin
-#BINDIR= /dev/env/DJDIR/bin
-BINDIR= /usr/bin
+LOCAL_MKF= ../Makefile.local

-#LIBDIR= ${PREFIX}/lib
-#LIBDIR= /dev/env/DJDIR/lib
-LIBDIR= /usr/lib
+# The set of Makefiles
+#
+MK_SET= ${MAKE_FILE} ${CONFIG_MKF} ${TARGET_MKF} ${LOCAL_MKF}

-#CALC_SHAREDIR= ${PREFIX}/lib/calc
-#CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-CALC_SHAREDIR= /usr/share/calc

-# By default, these values are based CALC_SHAREDIR, INCDIR, BINDIR
-# ---------------------------------------------------------------
-# ${HELPDIR}		where the help directory is installed
-# ${CALC_INCDIR}	where the calc include files are installed
-# ${SCRIPTDIR}		where calc shell scripts are installed
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# If in doubt, set:
-#
-#	HELPDIR= ${CALC_SHAREDIR}/help
-#	CALC_INCDIR= ${INCDIR}/calc
-#	SCRIPTDIR= ${BINDIR}/cscript
-#
-HELPDIR= ${CALC_SHAREDIR}/help
-CALC_INCDIR= ${INCDIR}/calc
-SCRIPTDIR= ${BINDIR}/cscript
+#######################################################
+# Calc configuration and compile configuration values #
+#######################################################
+include ${CONFIG_MKF}

-# T - top level directory under which calc will be installed
-#
-# The calc install is performed under ${T}, the calc build is
-# performed under /.	The purpose for ${T} is to allow someone
-# to install calc somewhere other than into the system area.
-#
-# For example, if:
-#
-#     BINDIR= /usr/bin
-#     LIBDIR= /usr/lib
-#     CALC_SHAREDIR= /usr/share/calc
-#
-# and if:
-#
-#     T= /var/tmp/testing
-#
-# Then the installation locations will be:
-#
-#     calc binary files:	/var/tmp/testing/usr/bin
-#     calc link library:	/var/tmp/testing/usr/lib
-#     calc help, .cal ...:	/var/tmp/testing/usr/share/calc
-#     ... etc ...		/var/tmp/testing/...
-#
-# If ${T} is empty, calc is installed under /, which is the same
-# top of tree for which it was built.  If ${T} is non-empty, then
-# calc is installed under ${T}, as if one had to chroot under
-# ${T} for calc to operate.
-#
-# If in doubt, use T=
-#
-T=
+
+###############################
+# host target section include #
+###############################
+include ${TARGET_MKF}
+
+
+##########################################################################
+#=-=-=-=-=- Be careful if you change something below this line -=-=-=-=-=#
+##########################################################################

 # Makefile debug
 #
@@ -240,29 +113,6 @@ H=@
 V=@:
 #V=@

-# standard tools
-#
-CAT= cat
-CHMOD= chmod
-CMP= cmp
-CO= co
-CP= cp
-FMT= fmt
-MKDIR= mkdir
-MV= mv
-RM= rm
-RMDIR= rmdir
-SED= sed
-SORT= sort
-TOUCH= touch
-TRUE= true
-
-# NOTE: On some shells, echo is a builtin that does
-#	not understand -n, so we call /bin/echo -n
-#	directly to get around such shells.
-#
-ECHON= /bin/echo -n
-
 # The ${SCRIPT} list is the list of calc shell script files (without the .calc
 # extension) which will be installed.
 #
@@ -304,10 +154,26 @@ TARGETS= ${CSCRIPT_TARGETS} README
 #
 PHONY= all clobber distlist install

+
+############################################################
+# Allow Makefile.local to change any of the above settings #
+############################################################
+include ${LOCAL_MKF}
+
+
+###########################################
+# all - First and default Makefile target #
+###########################################
+
 # The reason for this Makefile
 #
 all: ${TARGETS} .all

+
+###############################
+# additional Makefile targets #
+###############################
+
 .PHONY: ${PHONY}

 README: README.src
--- a/custom.c
+++ b/custom.c
@@ -41,6 +41,8 @@
 # include <string.h>
 #endif

+EXTERN CONST struct custom cust[];	/* custom interface table */
+
 #else /* CUSTOM */

 #include "config.h"
@@ -66,6 +68,14 @@ custom(char *name, int count, VALUE **vals)

 	CONST struct custom *p;		/* current function */

+	/*
+	 * error if libcustcalc was compiled with CUSTOM undefined
+	 */
+	if (custom_compiled() == 0) {
+	    math_error("libcustcalc was compiled CUSTOM undefined");
+	    not_reached();
+	}
+
 	/*
 	 * search the custom interface table for a function
 	 */
@@ -98,6 +108,14 @@ custom(char *name, int count, VALUE **vals)

 #else /* CUSTOM */

+	/*
+	 * error if libcustcalc was compiled with CUSTOM defined
+	 */
+	if (custom_compiled() == 1) {
+	    math_error("libcustcalc was compiled with CUSTOM defined");
+	    not_reached();
+	}
+
 	fprintf(stderr,
 	    "%sCalc was built with custom functions disabled\n",
 	    (conf->tab_ok ? "\t" : ""));
--- a/custom.h
+++ b/custom.h
@@ -1,7 +1,7 @@
 /*
 * custom - interface for custom software and hardware interfaces
 *
- * Copyright (C) 1999-2007,2021  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021,2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -26,7 +26,7 @@

 /*
 * Be careful what you put in this file, upper .c files include
- * this file even when CUSTOM is not defined (ALLOW_CUSTOM is empty).
+ * this file even when CUSTOM is not defined (ALLOW_CUSTOM="-UCUSTOM").
 *
 * Don't include anything, let the including .c file bring in:
 *
@@ -73,11 +73,11 @@ struct custom {
 *
 * These are the required interfaces.  The dummy.c stubs these interfaces too.
 */
+E_FUNC int custom_compiled(void);	/* return 1 ==> libcustcalc compiled w/CUSTOM defined, else return 0 */
 E_FUNC VALUE custom(char*, int, VALUE**);	/* master custom interface */
 EXTERN BOOL allow_custom;		/* TRUE => custom builtins allowed */
 E_FUNC void showcustom(void);		/* print custom functions */
 E_FUNC void customhelp(char *);		/* direct custom help */
-EXTERN CONST struct custom cust[];	/* custom interface table */
 E_FUNC void init_custreg(void);		/* initialize custom registers */

 #endif /* !CUSTOM_H */
--- a/custom/CUSTOM_CAL
+++ b/custom/CUSTOM_CAL
@@ -19,6 +19,10 @@ must be invoked with a -C argument:

 when it is run.

+To disable custom even if -C is given, calc must be built with:
+
+	ALLOW_CUSTOM="-UCUSTOM"
+
 See the ../cal/README or "help resource" for information about
 calc resource standards and guidelines.

@@ -41,7 +45,7 @@ pzasusb8.cal
    Run custom("pzasusb8") on a standard set of data, print Endian
    related information and print value size information.

-## Copyright (C) 1999,2021  Landon Curt Noll
+## Copyright (C) 1999,2021,2023  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/custom/HOW_TO_ADD
+++ b/custom/HOW_TO_ADD
@@ -168,8 +168,7 @@ Step 5: Write your custom function
 		#endif /* CUSTOM */

 	   This allows this code to 'go away' when the upper Makefile
-	   disables the custom code (because ALLOW_CUSTOM no longer
-	   has the -DCUSTOM define).
+	   disables the custom code when CUSTOM is not defined.

 	b) The function type must be:

--- a/custom/Makefile
+++ b/custom/Makefile
@@ -4,13 +4,7 @@
 #
 # Copyright (C) 1999-2006,2014,2017-2018,2021,2023  Landon Curt Noll
 #
-# SRC: custom/Makefile
-#
-#	The "# SRC: ... - ..." comment line above indicates
-#	the origin of this file.
-#
-# IMPORTANT: Please see the section on Makefiles near the
-#	     bottom of the HOWTO.INSTALL file.
+# Suggestion: Read the ../HOWTO.INSTALL file.
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -29,131 +23,63 @@
 # Under source code control:	1997/03/09 02:28:54
 # File existed as early as:	1997
 #
+# This calculator first developed by David I. Bell with help/mods from others.
+#
 # chongo <was here> /\oo/\	http://www.isthe.com/chongo/
-# Share and enjoy!  :-) http://www.isthe.com/chongo/tech/comp/calc/
-#
-# calculator by David I. Bell with help/mods from others
-# Makefile by Landon Curt Noll
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/


-# The shell used by this Makefile
-#
-# On some systems, /bin/sh is a rather reduced shell with
-# deprecated behavior.
-#
-# If your system has a up to date, bash shell, then
-# you may wish to use:
-#
-#	SHELL= bash
-#
-# On some systems such as macOS, the bash shell is very
-# far behind to the point where is cannot be depended on.
-# On such systems, the sh may be a much better alternative
-# shell for this Makefile to use:
-#
-#	SHELL= sh
-#
-SHELL= bash
-#SHELL= sh
-#if 0	/* start of skip for non-Gnu makefiles */
-#
-ifeq ($(target),Darwin)
-SHELL:= /bin/sh
-endif
-#endif	/* end of skip for non-Gnu makefiles */
+# SUGGESTION: Instead of modifying this file, consider adding
+#	      statements to modify, replace or append Makefile
+#	      variables in the ../Makefile.local file.


-# PREFIX - Top level location for calc
+###########################################
+# Files used or included by this Makefile #
+###########################################
+
+# Normally certain files depend on the Makefile.  If the Makefile is
+# changed, then certain steps should be redone.  If MAKE_FILE is
+# set to Makefile, then these files will depend on Makefile.  If
+# MAKE_FILE is empty, then they won't.
 #
-# The PREFIX is often prepended to paths within calc and calc Makefiles.
+# If in doubt, set MAKE_FILE to Makefile
 #
-# Starting with calc v2.13.0.1, nearly all Makefile places that used
-# /usr/local now use ${PREFIX}.  An exception is the olduninstall rule
-# and, of course, this section. :-)
+MAKE_FILE= Makefile
+
+# Calc configuration and compile configuration values
 #
-# NOTE: The ${PREFIX} is not the same as ${T}.  The ${T} specifies
-#	a top level directory under which calc installs things.
-#	While usually ${T} is empty, it can be specific path
-#	as if calc where "chrooted" during an install.
-#	The ${PREFIX} value, during install, is a path between
-#	the top level ${T} install directory and the object
-#	such as an include file.
+CONFIG_MKF= ../Makefile.config
+
+# Host targets that are shared in common with both Makefile
+# and custom/Makefile.
 #
-# NOTE: See also, ${T}, below.
+TARGET_MKF= ../Makefile.target
+
+# Host target information.
 #
-# There are some paths that do NOT call under ${PREFIX}, such as
-# ${CALCPATH}, that include paths not under ${PREFIX}, but those
-# too are exceptions to this general rule.
+LOCAL_MKF= ../Makefile.local
+
+# The set of Makefiles
 #
-# When in doubt, try:
-#
-#	PREFIX= /usr/local
-#
-PREFIX= /usr/local
-#PREFIX= /usr
-#PREFIX= /usr/global
+MK_SET= ${MAKE_FILE} ${CONFIG_MKF} ${TARGET_MKF} ${LOCAL_MKF}


-# CCBAN is given to ${CC} in order to control if banned.h is in effect.
-#
-# The banned.h attempts to ban the use of certain dangerous functions
-# that, if improperly used, could compromise the computational integrity
-# if calculations.
-#
-# In the case of calc, we are motivated in part by the desire for calc
-# to correctly calculate: even during extremely long calculations.
-#
-# If UNBAN is NOT defined, then calling certain functions
-# will result in a call to a non-existent function (link error).
-#
-# While we do NOT encourage defining UNBAN, there may be
-# a system / compiler environment where re-defining a
-# function may lead to a fatal compiler complication.
-# If that happens, consider compiling as:
-#
-#	make clobber all chk CCBAN=-DUNBAN
-#
-# as see if this is a work-a-round.
-#
-# If YOU discover a need for the -DUNBAN work-a-round, PLEASE tell us!
-# Please send us a bug report.  See the file:
-#
-#	BUGS
-#
-# or the URL:
-#
-#	http://www.isthe.com/chongo/tech/comp/calc/calc-bugrept.html
-#
-# for how to send us such a bug report.
-#
-CCBAN= -UUNBAN
-#CCBAN= -DUNBAN
+#######################################################
+# Calc configuration and compile configuration values #
+#######################################################
+include ${CONFIG_MKF}


-#if 0	/* start of skip for non-Gnu makefiles */
+###############################
+# host target section include #
+###############################
+include ${TARGET_MKF}

-# Unfortunately due to the complex dependency issues between
-# Makefile, and custom/Makefile, parallel GNU make
-# is NOT recommended.
-#
-# XXX - fix this - XXX
-#
-.NOTPARALLEL:

-##############################################################################
-#-=-=-=-=-=-=-=-=- Identify the target machine, if possible -=-=-=-=-=-=-=-=-#
-##############################################################################
-
-# NOTE: You can force a target value by defining target as in:
-#
-#	make ...__optional_arguments_... target=value
-
-# Try uname -s if the target was not already set on the make command line
-#
-ifeq ($(target),)
-target=$(shell uname -s 2>/dev/null)
-endif
-#endif	/* end of skip for non-Gnu makefiles */
+##################################
+# Files managed by this Makefile #
+##################################

 # The custom calc resource files to install
 #
@@ -198,16 +124,10 @@ CUSTOM_SRC= c_argv.c c_devnull.c c_help.c c_sysinfo.c c_pzasusb8.c \
 CUSTOM_OBJ= c_argv.o c_devnull.o c_help.o c_sysinfo.o c_pzasusb8.o \
 	c_pmodm127.o c_register.o

-##############################################################################
-#-=-=-=-=-=-=-=-=- You may want to change some values below -=-=-=-=-=-=-=-=-#
-##############################################################################

-##############################################################################
-#-=-=-=-=-=-=- Defaults in case you want to build from this dir -=-=-=-=-=-=-#
-##############################################################################
-
-# Normally, the upper level makefile will set these values.  We provide
-# a default here just in case you want to build from this directory.
+##########################################################################
+#=-=-=-=-=- Be careful if you change something below this line -=-=-=-=-=#
+##########################################################################

 # Makefile debug
 #
@@ -241,346 +161,6 @@ H=@
 V=@:
 #V=@

-####
-# Normally, the upper level makefile will set these values.  We provide
-# a default here just in case you want to build from this directory.
-####
-
-# Where the system include (.h) files are kept
-#
-# For DJGPP, select:
-#
-#	INCDIR= /dev/env/DJDIR/include
-#
-# If in doubt, set:
-#
-#	INCDIR= /usr/include
-#
-
-#INCDIR= ${PREFIX}/include
-#INCDIR= /dev/env/DJDIR/include
-INCDIR= /usr/include
-
-# where to install calc related things
-#
-# ${BINDIR}		where to install calc binary files
-# ${LIBDIR}		where calc link library (*.a) files are installed
-# ${CALC_SHAREDIR}	where to install calc help, .cal, startup, config files
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# For DJGPP, select:
-#
-#	BINDIR= /dev/env/DJDIR/bin
-#	LIBDIR= /dev/env/DJDIR/lib
-#	CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-#
-# If in doubt, set:
-#
-#	BINDIR= /usr/bin
-#	LIBDIR= /usr/lib
-#	CALC_SHAREDIR= /usr/share/calc
-#
-#BINDIR= ${PREFIX}/bin
-#BINDIR= /dev/env/DJDIR/bin
-BINDIR= /usr/bin
-
-#LIBDIR= ${PREFIX}/lib
-#LIBDIR= /dev/env/DJDIR/lib
-LIBDIR= /usr/lib
-
-#CALC_SHAREDIR= ${PREFIX}/lib/calc
-#CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-CALC_SHAREDIR= /usr/share/calc
-
-# By default, these values are based CALC_SHAREDIR, INCDIR, BINDIR
-# ---------------------------------------------------------------
-# ${HELPDIR}		where the help directory is installed
-# ${CALC_INCDIR}	where the calc include files are installed
-# ${CUSTOMCALDIR}	where custom *.cal files are installed
-# ${CUSTOMHELPDIR}	where custom help files are installed
-# ${CUSTOMINCDIR}	where custom .h files are installed
-# ${SCRIPTDIR}		where calc shell scripts are installed
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# If in doubt, set:
-#
-#	HELPDIR= ${CALC_SHAREDIR}/help
-#	CALC_INCDIR= ${INCDIR}/calc
-#	CUSTOMCALDIR= ${CALC_SHAREDIR}/custom
-#	CUSTOMHELPDIR= ${CALC_SHAREDIR}/custhelp
-#	CUSTOMINCDIR= ${CALC_INCDIR}/custom
-#	SCRIPTDIR= ${BINDIR}/cscript
-#
-HELPDIR= ${CALC_SHAREDIR}/help
-CALC_INCDIR= ${INCDIR}/calc
-CUSTOMCALDIR= ${CALC_SHAREDIR}/custom
-CUSTOMHELPDIR= ${CALC_SHAREDIR}/custhelp
-CUSTOMINCDIR= ${CALC_INCDIR}/custom
-SCRIPTDIR= ${BINDIR}/cscript
-
-# T - top level directory under which calc will be installed
-#
-# The calc install is performed under ${T}, the calc build is
-# performed under /.	The purpose for ${T} is to allow someone
-# to install calc somewhere other than into the system area.
-#
-# For example, if:
-#
-#     BINDIR= /usr/bin
-#     LIBDIR= /usr/lib
-#     CALC_SHAREDIR= /usr/share/calc
-#
-# and if:
-#
-#     T= /var/tmp/testing
-#
-# Then the installation locations will be:
-#
-#     calc binary files:	/var/tmp/testing/usr/bin
-#     calc link library:	/var/tmp/testing/usr/lib
-#     calc help, .cal ...:	/var/tmp/testing/usr/share/calc
-#     ... etc ...		/var/tmp/testing/...
-#
-# If ${T} is empty, calc is installed under /, which is the same
-# top of tree for which it was built.  If ${T} is non-empty, then
-# calc is installed under ${T}, as if one had to chroot under
-# ${T} for calc to operate.
-#
-# If in doubt, use T=
-#
-T=
-
-# Debug/Optimize options for ${CC} and ${LCC}
-#
-# Select DEBUG= -O2 -gstabs+ -D_WIN32 for DJGPP.
-#
-#DEBUG=
-#
-#DEBUG= -O
-#DEBUG= -O -g
-#DEBUG= -O -g3
-#
-#DEBUG= -O1
-#DEBUG= -O1 -g
-#DEBUG= -O1 -g3
-#
-#DEBUG= -O2
-#DEBUG= -O2 -g
-#DEBUG= -O2 -g3
-#DEBUG= -O2 -ipa
-#DEBUG= -O2 -g3 -ipa
-#
-#DEBUG= -O3
-#DEBUG= -O3 -g
-DEBUG= -O3 -g3
-#DEBUG= -O3 -ipa
-#DEBUG= -O3 -g3 -ipa
-#
-#DEBUG= -g
-#DEBUG= -g3
-#DEBUG= -gx
-#DEBUG= -WM,-g
-#
-#DEBUG= -O2 -gstabs+ -D_WIN32
-
-# Some systems require one to use ranlib to add a symbol table to
-# a *.a link library.  Set RANLIB to the utility that performs this
-# action.  Set RANLIB to : if your system does not need such a utility.
-#
-RANLIB=ranlib
-#RANLIB=:
-
-# Normally certain files depend on the Makefile.  If the Makefile is
-# changed, then certain steps should be redone.	 If MAKE_FILE is
-# set to Makefile, then these files will depend on Makefile.  If
-# MAKE_FILE is empty, then they wont.
-#
-# If in doubt, set MAKE_FILE to Makefile
-#
-MAKE_FILE= Makefile
-#MAKE_FILE=
-
-# If you do not wish to use purify, set PURIFY to an empty string.
-#
-# If in doubt, use PURIFY=
-#
-#PURIFY= purify
-#PURIFY= purify -m71-engine
-#PURIFY= purify -logfile=pure.out
-#PURIFY= purify -m71-engine -logfile=pure.out
-PURIFY=
-
-# If you want to use a debugging link library such as a malloc debug link
-# library, or need to add special ld flags after the calc link libraries
-# are included, set ${LD_DEBUG} below.
-#
-# If in doubt, set LD_DEBUG to empty.
-#
-#LD_DEBUG= -lmalloc_cv
-LD_DEBUG=
-
-# When doing a:
-#
-#	make check
-#	make chk
-#	make debug
-#
-# the ${CALC_ENV} is used to supply the proper environment variables
-# to calc.  Most people will simply need 'CALCPATH=./cal' to ensure
-# that these debug rules will only use calc resource files under the
-# local source directory.  The longer lines (with MALLOC_VERBOSE=1 ...)
-# are useful for SGI IRIX people who have 'WorkShop Performance Tools'
-# and who also set 'LD_DEBUG= -lmalloc_cv' above.
-#
-# If in doubt, use CALC_ENV= CALCPATH=./cal.
-#
-CALC_ENV= CALCPATH=./cal
-#CALC_ENV= CALCPATH=./cal MALLOC_VERBOSE=1 MALLOC_TRACING=1 \
-#	  MALLOC_FASTCHK=1 MALLOC_FULLWARN=1
-#CALC_ENV= CALCPATH=./cal MALLOC_VERBOSE=1 MALLOC_TRACING=1 \
-#	  MALLOC_FASTCHK=1 MALLOC_FULLWARN=1 MALLOC_CLEAR_FREE=1 \
-#	  MALLOC_CLEAR_MALLOC=1
-
-# By default, custom builtin functions may only be executed if calc
-# is given the -C option.  This is because custom builtin functions
-# may invoke non-standard or non-portable code.	 One may completely
-# disable custom builtin functions by not compiling any of code
-#
-# ALLOW_CUSTOM= -DCUSTOM	# allow custom only if -C is given
-# ALLOW_CUSTOM=			# disable custom even if -C is given
-#
-# If in doubt, use ALLOW_CUSTOM= -DCUSTOM
-#
-ALLOW_CUSTOM= -DCUSTOM
-#ALLOW_CUSTOM=
-
-# Some out of date operating systems require / want an executable to
-# end with a certain file extension.  Some compile systems such as
-# Cygwin build calc as calc.exe.  The EXT variable is used to denote
-# the extension required by such.
-#
-# EXT=				# normal Un*x / Linux / GNU/Linux systems
-# EXT=.exe			# Windows / Cygwin
-#
-# If in doubt, use EXT=
-#
-EXT=
-#EXT=.exe
-
-# The default calc versions
-#
-VERSION= 2.14.3.0
-
-# Names of shared libraries with versions
-#
-LIB_EXT= .so
-LIB_EXT_VERSION= ${LIB_EXT}.${VERSION}
-
-# standard tools
-#
-AR= ar
-AWK= awk
-CHMOD= chmod
-CMP= cmp
-CO= co
-CP= cp
-DIFF= diff
-FMT= fmt
-GREP= grep
-LN= ln
-LS= ls
-MAKE= make
-MAKEDEPEND= makedepend
-MKDIR= mkdir
-MV= mv
-RM= rm
-RMDIR= rmdir
-SED= sed
-SORT= sort
-TAIL= tail
-TOUCH= touch
-TRUE= true
-
-# EXTRA_CFLAGS are flags given to ${CC} when compiling C files
-# EXTRA_LDFLAGS are flags given to ${CC} when linking progs
-#
-# Both CFLAGS and LDFLAGS are left blank in this Makefile by
-# default so that users may use them on the make command line
-# to always the way that C is compiled and files are linked
-# respectively.  For example:
-#
-#	make all EXTRA_CFLAGS="-DMAGIC" EXTRA_LDFLAGS="-lmagic"
-#
-# NOTE: These should be left blank in this Makefile to make it
-#       easier to add stuff on the command line.  If you want to
-#	to change the way calc is compiled by this Makefile, change
-#	the appropriate host target section below or a flag above.
-#
-EXTRA_CFLAGS=
-EXTRA_LDFLAGS=
-
-# COMMON_CFLAGS are the common ${CC} flags used for all progs, both
-#	    intermediate and final calc and calc related progs
-#
-COMMON_CFLAGS= -DCALC_SRC ${ALLOW_CUSTOM} ${CCWARN} ${CCMISC} ${EXTRA_CFLAGS}
-
-# COMMON_LDFLAGS are the common flags used for linking all progs, both
-#	     intermediate and final calc and calc related progs
-#
-COMMON_LDFLAGS= ${EXTRA_LDFLAGS}
-
-###########################################
-# Set the default compile flags for ${CC} #
-###########################################
-
-#if 0	/* start of skip for non-Gnu makefiles */
-
-# Required flags to compile C files for calc
-#
-# ICFLAGS are given to ${CC} for intermediate progs used to help compile calc
-# CFLAGS are given to ${CC} for calc progs other than intermediate progs
-#
-# NOTE: This does not work for: make-XYZ-only and BLD_TYPE != make-XYZ-only
-#
-ifeq ($(BLD_TYPE),calc-static-only)
-ICFLAGS= ${COMMON_CFLAGS} ${CCBAN} ${CC_STATIC}
-else
-ICFLAGS= ${COMMON_CFLAGS} ${CCBAN} ${CC_SHARE}
-endif
-CFLAGS= ${ICFLAGS} ${CCOPT}
-
-# Required flags to link files for calc
-#
-# ILDFLAGS for ${CC} in linking intermediate progs used to help compile calc
-# LDFLAGS for ${CC} in linking calc progs other than intermediate progs
-#
-ILDFLAGS= ${COMMON_LDFLAGS}
-LDFLAGS= ${LD_DEBUG} ${ILDFLAGS}
-
-#endif	/* end of skip for non-Gnu makefiles */
-
-##########################################################################
-#=-=-=-=-=- Be careful if you change something below this line -=-=-=-=-=#
-##########################################################################
-
-# include start from top Makefile - keep this line
-#if 0	/* start of skip for non-Gnu makefiles */
-###
-#
-# Allow Makefile.local to override any of the above settings
-#
-###
-EXCLUDE_FROM_CUSTOM_MAKEFILE=true	# include only middle of ../Makefile
-include ../Makefile
-#endif	/* end of skip for non-Gnu makefiles */
-# include end from top Makefile - keep this line
-
 # These .c files are required for the main custom interface and
 # for the custom support functions for libcustcalc${LIB_EXT_VERSION}.
 #
@@ -621,7 +201,7 @@ H_SRC= ${CUSTOM_H_SRC}
 # directory but are installed as help files from the help/Makefile.
 #
 DISTLIST= ${CUSTCALC_SRC} ${CUSTOM_CALC_FILES} ${CUSTOM_HELP} \
-	${INSTALL_H_SRC} CUSTOM_CAL HOW_TO_ADD Makefile Makefile.simple
+	${INSTALL_H_SRC} CUSTOM_CAL HOW_TO_ADD Makefile

 # These files are used to make (but not built) a calc .a link library
 #
@@ -637,17 +217,27 @@ CALC_STATIC_LIBCUSTCALC= libcustcalc.a

 # complete list of targets
 #
-TARGETS= ${BLD_TYPE} Makefile.simple
+TARGETS= ${BLD_TYPE}

-###
-#
-# The main reason for this Makefile	:-)
-#
-###
+
+############################################################
+# Allow Makefile.local to change any of the above settings #
+############################################################
+include ${LOCAL_MKF}
+
+
+###########################################
+# all - First and default Makefile target #
+###########################################

 all: ${TARGETS} ${INSTALL_H_SRC} ${CUSTOM_CALC_FILES} \
 	${CUSTOM_HELP} ${MAKE_FILE} .all

+
+###############################
+# additional Makefile targets #
+###############################
+
 calc-dynamic-only: ${CUSTCALC_OBJ} ${CALC_DYNAMIC_LIBCUSTCALC}

 calc-static-only: ${CUSTCALC_OBJ} ${CALC_STATIC_LIBCUSTCALC}
@@ -667,12 +257,6 @@ libcustcalc${LIB_EXT_VERSION}: ${CUSTCALC_OBJ} ${MAKE_FILE}
 c_sysinfo.o: c_sysinfo.c ${MAKE_FILE}
 	${CC} ${CFLAGS} c_sysinfo.c -c

-##
-#
-# used by the upper level Makefile
-#
-##
-
 # to determine of we have done all
 #
 .all:
@@ -721,72 +305,8 @@ calcliblist: ${CALCLIBLIST}
 	    fi; \
 	done

-#if 0	/* start of skip for non-Gnu makefiles */
-Makefile.simple: Makefile ../Makefile
-	${V} echo '=-=-=-=-= custom/${MAKE_FILE} start of $@ rule =-=-=-=-='
-	${Q} if [ -f $@.bak ]; then \
-		echo "custom/$@.bak exists, remove or move it"; \
-		exit 1; \
-	else \
-	    ${TRUE}; \
-	fi
-	-${Q} if [ -f $@ ]; then \
-	    ${MV} -f $@ $@.bak; \
-	fi
-	${Q} ${AWK} '/^#if 0/{skp=1} {if(!skp){print $$0}} /^#endif/{skp=0}' \
-	     Makefile | \
-	     ${SED} -e '/^# include start from top Makefile - keep /,$$d' \
-		    -e 's;^# SRC:.*;# SRC: custom/$@ - non-GNU version;' \
-		    -e '/^ifeq /d' \
-		    -e '/^ifneq /d' \
-		    -e '/^ifdef /d' \
-		    -e '/^ifndef /d' \
-		    -e '/^else/d' \
-		    -e '/^endif/d' \
-		    > $@
-	${Q} echo '# include start from top Makefile - keep this line' \
-	     >> $@
-	${Q} ${AWK} '/^#if 0/{skp=1} {if(!skp){print $$0}} /^#endif/{skp=0}' \
-	     ../Makefile | \
-	     ${SED} -e '1,/^# include start from top Makefile - keep /d' \
-		    -e '/^# include end from top Makefile - keep /,$$d' \
-		    -e '/^ifeq /d' \
-		    -e '/^ifneq /d' \
-		    -e '/^ifdef /d' \
-		    -e '/^ifndef /d' \
-		    -e '/^else/d' \
-		    -e '/^endif/d' \
-		    >> $@
-	${Q} echo '# include end from top Makefile - keep this line' \
-	     >> $@
-	${Q} ${AWK} '/^#if 0/{skp=1} {if(!skp){print $$0}} /^#endif/{skp=0}' \
-	     Makefile | \
-	     ${SED} -e '1,/^# include end from top Makefile - keep /d' \
-		    -e '/^ifeq /d' \
-		    -e '/^ifneq /d' \
-		    -e '/^ifdef /d' \
-		    -e '/^ifndef /d' \
-		    -e '/^else/d' \
-		    -e '/^endif/d' \
-		    >> $@
-	-${Q} if [ -s $@.bak ]; then \
-	    if ${CMP} -s $@.bak $@; then \
-		echo 'custom/$@ was already up to date'; \
-		echo 'restoring original custom/$@'; \
-		${MV} -f $@.bak $@; \
-	    else \
-		echo 'old custom/$@ is now custom/$@.bak'; \
-		echo 'updated custom/$@ formed'; \
-		(cd .. ; ${DIFF} -u custom/$@.bak custom/$@); \
-	    fi; \
-	else \
-	    echo 'new custom/$@ formed'; \
-	    echo; \
-	    (cd .. ; ${LS} -l custom/$@); \
-	    echo; \
-	fi
-	${V} echo '=-=-=-=-= custom/${MAKE_FILE} end of $@ rule =-=-=-=-='
-#endif	/* end of skip for non-Gnu makefiles */
+Makefile.simple:
+	${Q} echo Support for custom/$@ was dropped after the the release of calc v2.14.3.0.

 ##
 #
@@ -1079,7 +599,7 @@ install: all
 	    ${RM} -f ${T}${CUSTOMCALDIR}/libcustcalc.a; \
 	    echo "removed old ${T}${CUSTOMCALDIR}/libcustcalc.a"; \
 	fi
-	-${Q} if [ ! -z ${ALLOW_CUSTOM} ]; then \
+	-${Q} if [ X"${ALLOW_CUSTOM}" = "X-DCUSTOM" ]; then \
 	  if [ -f libcustcalc.a ]; then \
 	    if ${CMP} -s libcustcalc.a ${T}${LIBDIR}/libcustcalc.a; then \
 		${TRUE}; \
--- a/custom/Makefile.simple
+++ b/custom/Makefile.simple
--- a/custom/c_argv.c
+++ b/custom/c_argv.c
@@ -1,7 +1,7 @@
 /*
 * c_argv - a custom function display info about its args
 *
- * Copyright (C) 1999-2006,2021  Landon Curt Noll
+ * Copyright (C) 1999-2006,2021,2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -25,21 +25,32 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_argv_allowed = 1;		/* CUSTOM defined */
+#else /* CUSTOM */
+int c_argv_allowed = 0;		/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

 #include <stdio.h>

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"

-#include "config.h"
-#include "calc.h"
+#include "../config.h"
+#include "../calc.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "banned.h"	/* include after system header <> includes */
+#include "../banned.h"	/* include after system header <> includes */


 /*
--- a/custom/c_devnull.c
+++ b/custom/c_devnull.c
@@ -1,7 +1,7 @@
 /*
 * c_devnull - a custom function that does nothing
 *
- * Copyright (C) 1999-2004,2021  Landon Curt Noll
+ * Copyright (C) 1999-2004,2021,2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -25,21 +25,32 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_devnull_allowed = 1;	/* CUSTOM defined */
+#else /* CUSTOM */
+int c_devnull_allowed = 0;	/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

-#include "have_unistd.h"
+#include "../have_unistd.h"
 #if defined(HAVE_UNISTD_H)
 #include <unistd.h>
 #endif

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "banned.h"	/* include after system header <> includes */
+#include "../banned.h"	/* include after system header <> includes */


 /*
--- a/custom/c_help.c
+++ b/custom/c_help.c
@@ -1,7 +1,7 @@
 /*
 * c_help - custom help function
 *
- * Copyright (C) 1999-2004,2021,2022  Landon Curt Noll
+ * Copyright (C) 1999-2004,2021-2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -25,22 +25,33 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_help_allowed = 1;		/* CUSTOM defined */
+#else /* CUSTOM */
+int c_help_allowed = 0;		/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

-#include "have_unistd.h"
+#include "../have_unistd.h"
 #if defined(HAVE_UNISTD_H)
 #include <unistd.h>
 #endif

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "attribute.h"
-#include "banned.h"	/* include after system header <> includes */
+#include "../attribute.h"
+#include "../banned.h"	/* include after system header <> includes */


 /*
--- a/custom/c_pmodm127.c
+++ b/custom/c_pmodm127.c
@@ -1,7 +1,7 @@
 /*
 * c_pmodm127 - calculate q mod 2^(2^127-1)
 *
- * Copyright (C) 2004-2007,2021,2022  Landon Curt Noll
+ * Copyright (C) 2004-2007,2021-2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -24,20 +24,31 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_pmodm127_allowed = 1;	/* CUSTOM defined */
+#else /* CUSTOM */
+int c_pmodm127_allowed = 0;	/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

 #include <stdio.h>

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
-#include "zmath.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"
+#include "../zmath.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "attribute.h"
-#include "banned.h"	/* include after system header <> includes */
+#include "../attribute.h"
+#include "../banned.h"	/* include after system header <> includes */


 /* 2^255 */
--- a/custom/c_pzasusb8.c
+++ b/custom/c_pzasusb8.c
@@ -1,7 +1,7 @@
 /*
 * c_pzasusb8 - print numerator as a string of USB8s
 *
- * Copyright (C) 1999-2004,2021,2022  Ernest Bowen
+ * Copyright (C) 1999-2004,2021-2023  Ernest Bowen
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -24,20 +24,31 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_pzasusb8_allowed = 1;	/* CUSTOM defined */
+#else /* CUSTOM */
+int c_pzasusb8_allowed = 0;	/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

 #include <stdio.h>

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
-#include "zmath.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"
+#include "../zmath.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "attribute.h"
-#include "banned.h"	/* include after system header <> includes */
+#include "../attribute.h"
+#include "../banned.h"	/* include after system header <> includes */


 /*
--- a/custom/c_register.c
+++ b/custom/c_register.c
@@ -1,7 +1,7 @@
 /*
 * c_register - set or print a custom register value
 *
- * Copyright (C) 2007,2021,2022  Landon Curt Noll
+ * Copyright (C) 2007,2021-2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -25,22 +25,33 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_register_allowed = 1;	/* CUSTOM defined */
+#else /* CUSTOM */
+int c_register_allowed = 0;	/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

 #include <stdio.h>

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"

-#include "config.h"
-#include "calc.h"
+#include "../config.h"
+#include "../calc.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "attribute.h"
-#include "banned.h"	/* include after system header <> includes */
+#include "../attribute.h"
+#include "../banned.h"	/* include after system header <> includes */


 /*
--- a/custom/c_sysinfo.c
+++ b/custom/c_sysinfo.c
@@ -1,7 +1,7 @@
 /*
 * c_sysinfo - names and values of selected #defines
 *
- * Copyright (C) 1999-2007,2021,2022  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021-2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -25,40 +25,51 @@
 */


+/*
+ * ISO C requires a translation unit to contain at least one declaration,
+ * so we declare a global variable whose value is based on if CUSTOM is defined.
+ */
+#if defined(CUSTOM)
+int c_sysinfo_allowed = 1;	/* CUSTOM defined */
+#else /* CUSTOM */
+int c_sysinfo_allowed = 0;	/* CUSTOM undefined */
+#endif /* CUSTOM */
+
+
 #if defined(CUSTOM)

 #include <stdio.h>
 #include <ctype.h>

-#include "have_string.h"
+#include "../have_string.h"
 #if defined(HAVE_STRING_H)
 #include <string.h>
 #endif

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"

-#include "config.h"
-#include "lib_calc.h"
-#include "calc.h"
-#include "longbits.h"
+#include "../config.h"
+#include "../lib_calc.h"
+#include "../calc.h"
+#include "../longbits.h"
 #define CHECK_L_FORMAT
-#include "block.h"
-#include "calcerr.h"
-#include "conf.h"
-#include "endian_calc.h"
-#include "fposval.h"
-#include "hist.h"
-#include "prime.h"
-#include "zrand.h"
-#include "zrandom.h"
+#include "../block.h"
+#include "../calcerr.h"
+#include "../conf.h"
+#include "../endian_calc.h"
+#include "../fposval.h"
+#include "../hist.h"
+#include "../prime.h"
+#include "../zrand.h"
+#include "../zrandom.h"

-#include "have_unused.h"
+#include "../have_unused.h"


-#include "attribute.h"
-#include "banned.h"	/* include after system header <> includes */
+#include "../attribute.h"
+#include "../banned.h"	/* include after system header <> includes */


 /*
--- a/custom/custtbl.c
+++ b/custom/custtbl.c
@@ -1,7 +1,7 @@
 /*
 * custtbl - custom interface table
 *
- * Copyright (C) 1999-2007,2021  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021,2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
@@ -24,19 +24,37 @@
 * Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
 */

+
 #include <unistd.h>

-#include "have_const.h"
-#include "value.h"
-#include "custom.h"
+#include "../have_const.h"
+#include "../value.h"
+#include "../custom.h"


-#include "banned.h"	/* include after system header <> includes */
+#include "../banned.h"	/* include after system header <> includes */


 /*
- * NOTE: See the file CUSTOM for instructions on how to add
- *	 custom functions.
+ * custom_compiled - determine if custom functions are compiled into libcustcalc
+ *
+ * returns:
+s*	1 ==> libcustcalc was compiled with CUSTOM defined
+ *	0 ==> libcustcalc was compiled with CUSTOM undefined
+ */
+E_FUNC int
+custom_compiled(void)
+{
+#if defined(CUSTOM)
+	return 1;
+#else /* CUSTOM */
+	return 0;
+#endif /* CUSTOM */
+}
+
+
+/*
+ * NOTE: See the file HOW_TO_ADD for instructions on how to add custom functions.
 */


--- a/help/Makefile
+++ b/help/Makefile
@@ -4,13 +4,7 @@
 #
 # Copyright (C) 1999-2006,2017,2021-2023  Landon Curt Noll
 #
-# SRC: help/Makefile
-#
-#	The "# SRC: ... - ..." comment line above indicates
-#	the origin of this file.
-#
-# IMPORTANT: Please see the section on Makefiles near the
-#	     bottom of the HOWTO.INSTALL file.
+# Suggestion: Read the ../HOWTO.INSTALL file.
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
@@ -29,184 +23,63 @@
 # Under source code control:	1991/07/23 06:47:57
 # File existed as early as:	1991
 #
+# This calculator first developed by David I. Bell with help/mods from others.
+#
 # chongo <was here> /\oo/\	http://www.isthe.com/chongo/
-# Share and enjoy!  :-) http://www.isthe.com/chongo/tech/comp/calc/
-#
-# calculator by David I. Bell with help/mods from others
-# Makefile by Landon Curt Noll
+# Share and enjoy!  :-)		http://www.isthe.com/chongo/tech/comp/calc/


-# The shell used by this Makefile
-#
-# On some systems, /bin/sh is a rather reduced shell with
-# deprecated behavior.
-#
-# If your system has a up to date, bash shell, then
-# you may wish to use:
-#
-#	SHELL= bash
-#
-# On some systems such as macOS, the bash shell is very
-# far behind to the point where is cannot be depended on.
-# On such systems, the sh may be a much better alternative
-# shell for this Makefile to use:
-#
-#	SHELL= sh
-#
-SHELL= bash
-#SHELL= sh
-#if 0	/* start of skip for non-Gnu makefiles */
-#
-ifeq ($(target),Darwin)
-SHELL:= /bin/sh
-endif
-#endif	/* end of skip for non-Gnu makefiles */
+# SUGGESTION: Instead of modifying this file, consider adding
+#	      statements to modify, replace or append Makefile
+#	      variables in the ../Makefile.local file.


-####
-# Normally, the upper level makefile will set these values.  We provide
-# a default here just in case you want to build from this directory.
-####
-
-# PREFIX - Top level location for calc
-#
-# The PREFIX is often prepended to paths within calc and calc Makefiles.
-#
-# Starting with calc v2.13.0.1, nearly all Makefile places that used
-# /usr/local now use ${PREFIX}.  An exception is the olduninstall rule
-# and, of course, this section. :-)
-#
-# NOTE: The ${PREFIX} is not the same as ${T}.  The ${T} specifies
-#	a top level directory under which calc installs things.
-#	While usually ${T} is empty, it can be specific path
-#	as if calc where "chrooted" during an install.
-#	The ${PREFIX} value, during install, is a path between
-#	the top level ${T} install directory and the object
-#	such as an include file.
-#
-# NOTE: See also, ${T}, below.
-#
-# There are some paths that do NOT call under ${PREFIX}, such as
-# ${CALCPATH}, that include paths not under ${PREFIX}, but those
-# too are exceptions to this general rule.
-#
-# When in doubt, try:
-#
-#	PREFIX= /usr/local
-#
-PREFIX= /usr/local
-#PREFIX= /usr
-#PREFIX= /usr/global
+###########################################
+# Files used or included by this Makefile #
+###########################################

 # Normally certain files depend on the Makefile.  If the Makefile is
 # changed, then certain steps should be redone.  If MAKE_FILE is
 # set to Makefile, then these files will depend on Makefile.  If
-# MAKE_FILE is empty, then they wont.
+# MAKE_FILE is empty, then they won't.
 #
 # If in doubt, set MAKE_FILE to Makefile
 #
 MAKE_FILE= Makefile

-# Where the system include (.h) files are kept
-#
-# For DJGPP, select:
-#
-#	INCDIR= /dev/env/DJDIR/include
-#
-# If in doubt, set:
-#
-#	INCDIR= /usr/include
+# Calc configuration and compile configuration values
 #
+CONFIG_MKF= ../Makefile.config

-#INCDIR= /usr/local/include
-#INCDIR= /dev/env/DJDIR/include
-INCDIR= /usr/include
+# Host targets that are shared in common with both Makefile
+# and custom/Makefile.
+#
+TARGET_MKF= ../Makefile.target

-# where to install calc related things
+# Host target information.
 #
-# ${BINDIR}		where to install calc binary files
-# ${LIBDIR}		where calc link library (*.a) files are installed
-# ${CALC_SHAREDIR}	where to install calc help, .cal, startup, config files
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# For DJGPP, select:
-#
-#	BINDIR= /dev/env/DJDIR/bin
-#	LIBDIR= /dev/env/DJDIR/lib
-#	CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-#
-# If in doubt, set:
-#
-#	BINDIR= /usr/bin
-#	LIBDIR= /usr/lib
-#	CALC_SHAREDIR= /usr/share/calc
-#
-#BINDIR= ${PREFIX}/bin
-#BINDIR= /dev/env/DJDIR/bin
-BINDIR= /usr/bin
+LOCAL_MKF= ../Makefile.local

-#LIBDIR= ${PREFIX}/lib
-#LIBDIR= /dev/env/DJDIR/lib
-LIBDIR= /usr/lib
+# The set of Makefiles
+#
+MK_SET= ${MAKE_FILE} ${CONFIG_MKF} ${TARGET_MKF} ${LOCAL_MKF}

-#CALC_SHAREDIR= ${PREFIX}/lib/calc
-#CALC_SHAREDIR= /dev/env/DJDIR/share/calc
-CALC_SHAREDIR= /usr/share/calc

-# By default, these values are based CALC_SHAREDIR, INCDIR, BINDIR
-# ---------------------------------------------------------------
-# ${HELPDIR}		where the help directory is installed
-# ${CALC_INCDIR}	where the calc include files are installed
-# ${SCRIPTDIR}		where calc shell scripts are installed
-#
-# NOTE: The install rule prepends installation paths with ${T}, which
-#	by default is empty.  If ${T} is non-empty, then installation
-#	locations will be relative to the ${T} directory.
-#
-# If in doubt, set:
-#
-#	HELPDIR= ${CALC_SHAREDIR}/help
-#	CALC_INCDIR= ${INCDIR}/calc
-#	SCRIPTDIR= ${BINDIR}/cscript
-#
-HELPDIR= ${CALC_SHAREDIR}/help
-CALC_INCDIR= ${INCDIR}/calc
-SCRIPTDIR= ${BINDIR}/cscript
+#######################################################
+# Calc configuration and compile configuration values #
+#######################################################
+include ${CONFIG_MKF}

-# T - top level directory under which calc will be installed
-#
-# The calc install is performed under ${T}, the calc build is
-# performed under /.	The purpose for ${T} is to allow someone
-# to install calc somewhere other than into the system area.
-#
-# For example, if:
-#
-#     BINDIR= /usr/bin
-#     LIBDIR= /usr/lib
-#     CALC_SHAREDIR= /usr/share/calc
-#
-# and if:
-#
-#     T= /var/tmp/testing
-#
-# Then the installation locations will be:
-#
-#     calc binary files:	/var/tmp/testing/usr/bin
-#     calc link library:	/var/tmp/testing/usr/lib
-#     calc help, .cal ...:	/var/tmp/testing/usr/share/calc
-#     ... etc ...		/var/tmp/testing/...
-#
-# If ${T} is empty, calc is installed under /, which is the same
-# top of tree for which it was built.  If ${T} is non-empty, then
-# calc is installed under ${T}, as if one had to chroot under
-# ${T} for calc to operate.
-#
-# If in doubt, use T=
-#
-T=
+
+###############################
+# host target section include #
+###############################
+include ${TARGET_MKF}
+
+
+##########################################################################
+#=-=-=-=-=- Be careful if you change something below this line -=-=-=-=-=#
+##########################################################################

 # Makefile debug
 #
@@ -240,41 +113,11 @@ H=@
 V=@:
 #V=@

-# standard tools
-#
-CAT= cat
-CHMOD= chmod
-CMP= cmp
-CP= cp
-FMT= fmt
-GREP= grep
-ICFLAGS=
-ILDFLAGS=
-LCC= cc
-MKDIR= mkdir
-MV= mv
-RM= rm
-RMDIR= rmdir
-SED= sed
-SORT= sort
-TOUCH= touch
-TRUE= true

-# Some out of date operating systems require / want an executable to
-# end with a certain file extension.  Some compile systems such as
-# Cygwin build calc as calc.exe.  The EXT variable is used to denote
-# the extension required by such.
-#
-# EXT=				# normal Un*x / Linux / GNU/Linux systems
-# EXT=.exe			# Windows / Cygwin
-#
-# If in doubt, use EXT=
-#
-EXT=
-#EXT=.exe
+##################################
+# Files managed by this Makefile #
+##################################

-# Standard and Builtin help files
-#
 STD_HELP_FILES_1= intro overview help
 STD_HELP_FILES_2= assoc

@@ -414,9 +257,25 @@ CALCLIBLIST=
 #
 PHONY= all clobber distlist install

+
+############################################################
+# Allow Makefile.local to change any of the above settings #
+############################################################
+include ${LOCAL_MKF}
+
+
+###########################################
+# all - First and default Makefile target #
+###########################################
+
 all: ${FULL_HELP_FILES} full ${DETAIL_HELP} ${DETAIL_CLONE} \
     ${SINGULAR_FILES} .all

+
+###############################
+# additional Makefile targets #
+###############################
+
 # used by the upper level Makefile to determine of we have done all
 #
 # NOTE: Due to bogus shells found on one common system we must have
--- a/help/config
+++ b/help/config
@@ -832,7 +832,7 @@ DESCRIPTION
    Returns TRUE if you calc was compiled with -DCUSTOM.  By default,
    the calc Makefile uses ALLOW_CUSTOM= -DCUSTOM so by default
    config("compile_custom") is TRUE.  If, however, calc is compiled
-    without -DCUSTOM, then config("compile_custom") will be FALSE.
+    with ALLOW_CUSTOM="-UCUSTOM", then config("compile_custom") will be FALSE.

    The config("compile_custom") value is only affected by compile
    flags.   The calc -D runtime command line option does not change
@@ -1042,7 +1042,7 @@ LINK LIBRARY
 SEE ALSO
     custom, custom_cal, display, epsilon, fprintf, printf, strprintf, usage

-## Copyright (C) 1999-2007,2018,2021  Landon Curt Noll
+## Copyright (C) 1999-2007,2018,2021,2023  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/help/custom
+++ b/help/custom
@@ -68,7 +68,8 @@ DESCRIPTION
 	    help contrib

 EXAMPLE
-    If calc compiled with ALLOW_CUSTOM= (custom disabled):
+    If calc compiled with ALLOW_CUSTOM="-UCUSTOM", the custom system
+    is disabled, even when -C is used on the command line:

    ; print custom("sysinfo", "baseb")
 	    Calc was built with custom functions disabled
@@ -94,7 +95,7 @@ LINK LIBRARY
 SEE ALSO
    custom_cal, new_custom, contrib

-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2023  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
--- a/rpm.mk
+++ b/rpm.mk
@@ -134,10 +134,12 @@ V=@:
 all: ver_calc calc.spec
 	${V} echo '=-=-=-=-= rpm.mk start of $@ rule =-=-=-=-='
 	PROJECT_VERSION="`./ver_calc`"; \
+	PROJECT_VER="`./ver_calc -V`"; \
 	PROJECT_RELEASE="`${SED} -n \
 	    -e '/^Release:/s/^Release: *//p' calc.spec.in`"; \
 	$(MAKE) -f rpm.mk rpm \
 	    PROJECT_VERSION="$$PROJECT_VERSION" \
+	    PROJECT_VER="$$PROJECT_VER" \
 	    PROJECT_RELEASE="$$PROJECT_RELEASE" Q= S= E=
 	${V} echo '=-=-=-=-= rpm.mk end of $@ rule =-=-=-=-='

@@ -158,6 +160,7 @@ calc.spec: calc.spec.in ver_calc
 	${V} echo '=-=-=-=-= rpm.mk start of $@ rule =-=-=-=-='
 	${RM} -f calc.spec
 	${SED} -e 's/<<<PROJECT_VERSION>>>/'"`./ver_calc`"/g \
+	       -e 's/<<<PROJECT_VER>>>/'"`./ver_calc -V`"/g \
 	    calc.spec.in > calc.spec
 	${V} echo '=-=-=-=-= rpm.mk end of $@ rule =-=-=-=-='

@@ -167,6 +170,7 @@ srcpkg: make_rhdir
 	${V} echo RPM_TOP="${RPM_TOP}"
 	${V} echo RPM_BUILD_ROOT="${RPM_BUILD_ROOT}"
 	${V} echo PROJECT_VERSION="${PROJECT_VERSION}"
+	${V} echo PROJECT_VER="${PROJECT_VER}"
 	${V} echo PROJECT_RELEASE="${PROJECT_RELEASE}"
 	${RM} -rf "$(TMPDIR)/$(PROJECT)"
 	${FIND} . -depth -print | \
@@ -190,6 +194,7 @@ rpm: srcpkg calc.spec
 	${V} echo RPM_TOP="${RPM_TOP}"
 	${V} echo RPM_BUILD_ROOT="${RPM_BUILD_ROOT}"
 	${V} echo PROJECT_VERSION="${PROJECT_VERSION}"
+	${V} echo PROJECT_VER="${PROJECT_VER}"
 	${V} echo PROJECT_RELEASE="${PROJECT_RELEASE}"
 	$(MAKE) -f Makefile clean Q= S= E=
 	${CP} "$(SPECFILE)" "$(RPM_TOP)/SPECS/$(SPECFILE)"
@@ -210,6 +215,7 @@ make_rhdir:
 	${V} echo RPM_TOP="${RPM_TOP}"
 	${V} echo RPM_BUILD_ROOT="${RPM_BUILD_ROOT}"
 	${V} echo PROJECT_VERSION="${PROJECT_VERSION}"
+	${V} echo PROJECT_VER="${PROJECT_VER}"
 	${V} echo PROJECT_RELEASE="${PROJECT_RELEASE}"
 	for subdir in "" BUILD RPMS SOURCES SPECS SRPMS tmp; do \
 	    i="$(RPM_TOP)/$$subdir"; \
@@ -287,7 +293,10 @@ test: ver_calc
 	    echo "test needs to install, must be root to test" 1>&2; \
 	    exit 6; \
 	fi
-	$(MAKE) -f rpm.mk PROJECT_VERSION="`./ver_calc`" installrpm \
+	$(MAKE) -f rpm.mk \
+		PROJECT_VERSION="`./ver_calc`" \
+		PROJECT_VER="`./ver_calc -V`" \
+		installrpm \
 		chksys Q= S= E=
 	${V} echo '=-=-=-=-= rpm.mk end of $@ rule =-=-=-=-='

--- a/version.c
+++ b/version.c
@@ -84,7 +84,7 @@ static char *program;
 #define MAJOR_VER	2	/* major library version */
 #define MINOR_VER	14	/* minor library version */
 #define MAJOR_PATCH	3	/* major software version level */
-#define MINOR_PATCH	0	/* minor software version level */
+#define MINOR_PATCH	5	/* minor software version level */


 /*