diff --git a/CHANGES b/CHANGES
index 0787236..1117dd4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -54,6 +54,15 @@ The following are the changes from calc version 2.12.8.0 to date:
 
 	    http://www.isthe.com/chongo/tech/comp/calc/calc-question.html
 
+    Fixed how the *.tar.bz2 are formed.  The calc-2.12.8.0.tar.bz2 file
+    that was formed for calc version 2.12.8.0 was missing most files.
+
+    Expanded 'make chk' to also verify that 'make distchk' and 'make
+    distlist' execute successfully.  This will help check a regression
+    of the bug that produced the bogus calc-2.12.8.0.tar.bz2 file.
+
+    Added additional regression tests related 0^(zero_expression)==1.
+
 
 The following are the changes from calc version 2.12.7.1 to 2.12.7.5:
 
diff --git a/Makefile.ship b/Makefile.ship
index 5065f7f..fda2af6 100644
--- a/Makefile.ship
+++ b/Makefile.ship
@@ -1053,7 +1053,7 @@ EXT=
 
 # The default calc versions
 #
-VERSION= 2.12.8.0
+VERSION= 2.12.8.1
 
 # Names of shared libraries with versions
 #
@@ -2088,7 +2088,7 @@ LICENSE= COPYING COPYING-LGPL
 #
 DISTLIST= ${C_SRC} ${H_SRC} ${MAKE_FILE} BUGS CHANGES LIBRARY README.FIRST \
 	  README.WINDOWS calc.man HOWTO.INSTALL ${UTIL_MISC_SRC} ${LICENSE} \
-	  sample.README calc.spec.in rpm.mk README.md QUESTION CONTRIB-CODE
+	  sample.README calc.spec.in rpm.mk README.md QUESTIONS CONTRIB-CODE
 
 # These files are used to make (but not build) a calc .a link library
 #
@@ -4032,6 +4032,9 @@ check: all ./cal/regress.cal
 chk: ./cal/regress.cal
 	${V} echo '=-=-=-=-= ${MAKE_FILE} start of $@ rule =-=-=-=-='
 	${CALC_ENV} ./calc${EXT} -d -q read regress 2>&1 | ${AWK} -f check.awk
+	@${MAKE} -f Makefile Q= V=@ distdir >/dev/null 2>&1
+	@${MAKE} -f Makefile Q= V=@ distlist >/dev/null 2>&1
+	${Q} echo 'chk OK'
 	${V} echo '=-=-=-=-= ${MAKE_FILE} end of $@ rule =-=-=-=-='
 
 ###
diff --git a/cal/regress.cal b/cal/regress.cal
index a0d0043..dc94544 100644
--- a/cal/regress.cal
+++ b/cal/regress.cal
@@ -356,8 +356,17 @@ define test_arithmetic()
 	vrfy(-16^-2 == -1/256,	'447: -16^-2 == -1/256');
 	vrfy(-7^2 == -49,	'448: -7^2 == -49');
 	vrfy(-3! == -6,		'449: -3! == -6');
+	vrfy(0^(0-0) == 1,	'450: 0^(0-0) == 1');
+	vrfy(0^(2-2) == 1,	'451: 0^(2-2) == 1');
+	vrfy(2^0 == 1,		'452: 2^0 == 1');
+	vrfy(2^(0-0) == 1,	'453: 2^(0-0) == 1');
+	vrfy(2^(2-2) == 1,	'454: 2^(2-2) == 1');
+	vrfy((2^23209-1)^0 == 1,	'455: (2^23209-1)^0 == 1');
+	vrfy((2^23209-1)^(0-0) == 1,	'456: (2^23209-1)^(0-0) == 1');
+	vrfy((2^23209-1)^(2-2) == 1,	'457: (2^23209-1)^(2-2) == 1');
+	vrfy((2^23209-1)^((2^23209-1)-(2^23209-1)) == 1,	'458: (2^23209-1)^((2^23209-1)-(2^23209-1)) == 1');
 
-	print '450: Ending test_arithmetic';
+	print '459: Ending test_arithmetic';
 }
 print '009: parsed test_arithmetic()';
 
diff --git a/custom/Makefile b/custom/Makefile
index f1b74aa..10c8039 100644
--- a/custom/Makefile
+++ b/custom/Makefile
@@ -348,7 +348,7 @@ EXT=
 
 # The default calc versions
 #
-VERSION= 2.12.8.0
+VERSION= 2.12.8.1
 
 # Names of shared libraries with versions
 #
diff --git a/custom/Makefile.head b/custom/Makefile.head
index 6760bf2..de105c4 100644
--- a/custom/Makefile.head
+++ b/custom/Makefile.head
@@ -348,7 +348,7 @@ EXT=
 
 # The default calc versions
 #
-VERSION= 2.12.8.0
+VERSION= 2.12.8.1
 
 # Names of shared libraries with versions
 #
diff --git a/version.c b/version.c
index a204206..ce985bd 100644
--- a/version.c
+++ b/version.c
@@ -45,7 +45,7 @@ static char *program;
 #define MAJOR_VER	2	/* major library version */
 #define MINOR_VER	12	/* minor library version */
 #define MAJOR_PATCH	8	/* major software version level */
-#define MINOR_PATCH	0	/* minor software version level */
+#define MINOR_PATCH	1	/* minor software version level */
 
 
 /*