diff --git a/CHANGES b/CHANGES
index 38288d6..85619a7 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,6 +2,8 @@ The following are the changes from calc version 2.14.0.11 to date:
 
     Fixed a number of typos.
 
+    Drop support for SunOS, IRIX and MINGW32_NT-5.0 targets.
+
 
 The following are the changes from calc version 2.14.0.9 to 2.14.0.10:
 
diff --git a/Makefile.ship b/Makefile.ship
index e5533b3..3334de4 100644
--- a/Makefile.ship
+++ b/Makefile.ship
@@ -1176,9 +1176,7 @@ LD_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.
+# local source directory.
 #
 # If in doubt, use:
 #
@@ -1186,13 +1184,6 @@ LD_DEBUG=
 #
 CALC_ENV= CALCPATH=./cal LD_LIBRARY_PATH=. DYLD_LIBRARY_PATH=. CALCHELP=./help \
 	  CALCCUSTOMHELP=./custom
-#CALC_ENV= CALCPATH=./cal DYLD_LIBRARY_PATH=. \
-#	  MALLOC_VERBOSE=1 MALLOC_TRACING=1 \
-#	  MALLOC_FASTCHK=1 MALLOC_FULLWARN=1 LD_LIBRARY_PATH=.:./custom
-#CALC_ENV= CALCPATH=./cal DYLD_LIBRARY_PATH=. \
-#	  MALLOC_VERBOSE=1 MALLOC_TRACING=1 \
-#	  MALLOC_FASTCHK=1 MALLOC_FULLWARN=1 MALLOC_CLEAR_FREE=1 \
-#	  MALLOC_CLEAR_MALLOC=1 LD_LIBRARY_PATH=.:./custom
 
 
 # Some out of date operating systems require/want an executable to
@@ -1636,58 +1627,6 @@ MAKE= gmake
 #
 endif
 
-################
-# SunOS target #
-################
-
-ifeq ($(target),SunOS)
-#
-BLD_TYPE= calc-dynamic-only
-#
-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}"
-ifdef ALLOW_CUSTOM
-LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
-else
-LIBCUSTCALC_SHLIB=
-endif
-#
-CC_STATIC=
-LIBCALC_STATIC=
-LIBCUSTCALC_STATIC=
-LD_STATIC=
-#
-# 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}
-#
-CCWARN= -Wall
-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
-
 #################
 # Cygwin target #
 #################
@@ -1791,55 +1730,6 @@ LDFLAGS= ${LD_DEBUG} ${ILDFLAGS} ${LIBCALC_STATIC} ${LIBCUSTCALC_STATIC}
 #if 0	/* start of skip for non-Gnu makefiles */
 endif
 
-###################################################
-# MINGW32_NT-5.0 target                           #
-###################################################
-
-
-ifeq ($(target),MINGW32_NT-5.0)
-
-EXT=.exe
-TERMCONTROL= -DUSE_WIN32
-ifdef ALLOW_CUSTOM
-#endif	/* end of skip for non-Gnu makefiles */
-CALCPATH= .;./cal;~/.cal;${T}${CALC_SHAREDIR};${T}${CUSTOMCALDIR}
-#if 0	/* start of skip for non-Gnu makefiles */
-else
-CALCPATH= .;./cal;~/.cal;${T}${CALC_SHAREDIR}
-endif
-CALCRC= ./.calcinit;~/.calcrc;${CALC_SHAREDIR}/startup
-#
-BLD_TYPE= calc-static-only
-#
-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}"
-ifdef ALLOW_CUSTOM
-LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
-else
-LIBCUSTCALC_SHLIB=
-endif
-#
-CC_STATIC= -DSTATIC_ONLY
-LIBCALC_STATIC=
-LIBCUSTCALC_STATIC=
-LD_STATIC=
-#
-CCWARN= -Wall
-WNO_IMPLICT= -Wno-implicit
-WNO_ERROR_LONG_LONG= -Wno-error=long-long
-WNO_LONG_LONG= -Wno-long-long
-CCWERR=
-CCOPT= ${DEBUG}
-CCMISC= -DNOTCYGWIN
-#
-LCC= gcc
-CC= ${PURIFY} ${LCC} ${CCWERR}
-#
-endif
-
 ###################################################
 # default target - when no specific target exists #
 ###################################################
diff --git a/custom/Makefile b/custom/Makefile
index 6bd25fe..15ed4c7 100644
--- a/custom/Makefile
+++ b/custom/Makefile
@@ -913,58 +913,6 @@ MAKE= gmake
 #
 endif
 
-################
-# SunOS target #
-################
-
-ifeq ($(target),SunOS)
-#
-BLD_TYPE= calc-dynamic-only
-#
-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}"
-ifdef ALLOW_CUSTOM
-LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
-else
-LIBCUSTCALC_SHLIB=
-endif
-#
-CC_STATIC=
-LIBCALC_STATIC=
-LIBCUSTCALC_STATIC=
-LD_STATIC=
-#
-# 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}
-#
-CCWARN= -Wall
-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
-
 #################
 # Cygwin target #
 #################
@@ -1068,55 +1016,6 @@ LDFLAGS= ${LD_DEBUG} ${ILDFLAGS} ${LIBCALC_STATIC} ${LIBCUSTCALC_STATIC}
 #if 0	/* start of skip for non-Gnu makefiles */
 endif
 
-###################################################
-# MINGW32_NT-5.0 target                           #
-###################################################
-
-
-ifeq ($(target),MINGW32_NT-5.0)
-
-EXT=.exe
-TERMCONTROL= -DUSE_WIN32
-ifdef ALLOW_CUSTOM
-#endif	/* end of skip for non-Gnu makefiles */
-CALCPATH= .;./cal;~/.cal;${T}${CALC_SHAREDIR};${T}${CUSTOMCALDIR}
-#if 0	/* start of skip for non-Gnu makefiles */
-else
-CALCPATH= .;./cal;~/.cal;${T}${CALC_SHAREDIR}
-endif
-CALCRC= ./.calcinit;~/.calcrc;${CALC_SHAREDIR}/startup
-#
-BLD_TYPE= calc-static-only
-#
-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}"
-ifdef ALLOW_CUSTOM
-LIBCUSTCALC_SHLIB= -shared "-Wl,-soname,libcustcalc${LIB_EXT_VERSION}"
-else
-LIBCUSTCALC_SHLIB=
-endif
-#
-CC_STATIC= -DSTATIC_ONLY
-LIBCALC_STATIC=
-LIBCUSTCALC_STATIC=
-LD_STATIC=
-#
-CCWARN= -Wall
-WNO_IMPLICT= -Wno-implicit
-WNO_ERROR_LONG_LONG= -Wno-error=long-long
-WNO_LONG_LONG= -Wno-long-long
-CCWERR=
-CCOPT= ${DEBUG}
-CCMISC= -DNOTCYGWIN
-#
-LCC= gcc
-CC= ${PURIFY} ${LCC} ${CCWERR}
-#
-endif
-
 ###################################################
 # default target - when no specific target exists #
 ###################################################
diff --git a/value.c b/value.c
index 8c78383..f21348c 100644
--- a/value.c
+++ b/value.c
@@ -2360,7 +2360,7 @@ testvalue(VALUE *vp)
 	case V_FILE:
 		return validid(vp->v_file);
 	case V_NULL:
-		break;	/* hack to get gcc on SunOS to be quiet */
+		break;
 	case V_OBJ:
 		val = objcall(OBJ_TEST, vp, NULL_VALUE, NULL_VALUE);
 		return (val.v_int != 0);
@@ -2385,7 +2385,6 @@ testvalue(VALUE *vp)
 	default:
 		return TRUE;
 	}
-	/* hack to get gcc on SunOS to be quiet */
 	return FALSE;
 }