taken from upstream

https://bugs.gentoo.org/531154

From 976a674b42f9647865d40fa417e7a3dc56a16e6e Mon Sep 17 00:00:00 2001
From: Grisha Trubetskoy <grisha@modpython.org>
Date: Thu, 19 Dec 2013 12:23:18 -0500
Subject: [PATCH] Fixes for compile without git, correct how git revision hash
 is generated (skip it if it's a tag or no git available or we are not working
 with a checkin), also fix a bash-dependency (helps on Solaris), and a couple
 of cross-platform awk fixes in configure.

---
 configure.in                |  6 +++---
 dist/version.sh             | 15 +++++++++++++--
 src/Makefile.in             | 14 +++++---------
 src/include/mod_python.h    |  1 -
 src/include/mod_python.h.in |  1 -
 src/include/mp_version.h    |  2 --
 6 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/dist/version.sh b/dist/version.sh
index 1060b4f..e50000d 100755
--- a/dist/version.sh
+++ b/dist/version.sh
@@ -5,6 +5,17 @@ MPV_PATH="`dirname $0`/../src/include/mp_version.h"
 MAJ=`awk '/MP_VERSION_MAJOR/ {print $3}' $MPV_PATH`
 MIN=`awk '/MP_VERSION_MINOR/ {print $3}' $MPV_PATH`
 PCH=`awk '/MP_VERSION_PATCH/ {print $3}' $MPV_PATH`
-GIT=`git describe --always`
 
-echo $MAJ.$MIN.$PCH-$GIT
+# if git exists in path
+if type git >/dev/null 2>&1; then
+    # and we are in a checkout
+    if git rev-parse 2>/dev/null; then
+        # but not on a tag (which means this is a release)
+        if test -z "`git log 'HEAD^!' --format=%d 2>/dev/null | grep 'tag: '`"; then
+            # append git revision hash to version
+            GIT="-`git describe --always`"
+        fi
+    fi
+fi
+
+echo $MAJ.$MIN.$PCH$GIT
diff --git a/src/Makefile.in b/src/Makefile.in
index c3b3fb2..081c954 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -50,7 +50,7 @@ psp_parser.c: psp_parser.l
 
 dso:	mod_python.so
 
-mod_python.so: $(SRCS) @SOLARIS_HACKS@ 
+mod_python.so: $(SRCS) @SOLARIS_HACKS@
 	@echo
 	@echo 'Building mod_python.so.'
 	@echo
@@ -64,21 +64,17 @@ distclean: clean
 	rm -f Makefile .depend
 
 version.c:
-	@MP_GIT_SHA=$$(git describe --always); \
-	echo > version.c ; \
+	@echo > version.c ; \
 	echo "/* THIS FILE IS AUTO-GENERATED BY Makefile */" >> version.c ; \
 	echo "#include \"mp_version.h\"" >> version.c ; \
-	echo "const char * const mp_git_sha = \"$${MP_GIT_SHA}\";" >> version.c ; \
 	echo "const int mp_version_major = MP_VERSION_MAJOR;" >> version.c ; \
 	echo "const int mp_version_minor = MP_VERSION_MINOR;" >> version.c ; \
 	echo "const int mp_version_patch = MP_VERSION_PATCH;" >> version.c ; \
-	echo "const char * const mp_version_string = MP_VERSION_STRING(MP_VERSION_MAJOR,MP_VERSION_MINOR,MP_VERSION_PATCH) \"-$${MP_GIT_SHA}\";" >> version.c ; \
-	echo "const char * const mp_version_component = \"mod_python/\" MP_VERSION_STRING(MP_VERSION_MAJOR,MP_VERSION_MINOR,MP_VERSION_PATCH) \"-$${MP_GIT_SHA}\";" >> version.c
-
-#	echo "const char * const mp_version_component = \"mod_python/\" #MP_VERSION_MAJOR \".\" #MP_VERSION_MINOR \".\" #MP_VERSION_PATCH \"-$${MP_GIT_SHA}\";" >> version.c
+	echo "const char * const mp_version_string = \"`../dist/version.sh`\";" >> version.c ; \
+	echo "const char * const mp_version_component = \"mod_python/\" \"`../dist/version.sh`\";" >> version.c
 
 # this is a hack to help avoid a gcc/solaris problem
-# python uses assert() which needs _eprintf(). See 
+# python uses assert() which needs _eprintf(). See
 # SOLARIS_HACKS above
 _eprintf.o:
 	ar -x `gcc -print-libgcc-file-name` _eprintf.o
diff --git a/src/include/mod_python.h b/src/include/mod_python.h
index 061146b..68a77d4 100644
--- a/src/include/mod_python.h
+++ b/src/include/mod_python.h
@@ -156,7 +156,6 @@ extern module AP_MODULE_DECLARE_DATA python_module;
 #define MUTEX_DIR "/tmp"
 
 /* version stuff */
-extern const char * const mp_git_sha;
 extern const int mp_version_major;
 extern const int mp_version_minor;
 extern const int mp_version_patch;
diff --git a/src/include/mod_python.h.in b/src/include/mod_python.h.in
index 4b6f1fb..7d536c5 100644
--- a/src/include/mod_python.h.in
+++ b/src/include/mod_python.h.in
@@ -156,7 +156,6 @@ extern module AP_MODULE_DECLARE_DATA python_module;
 #define MUTEX_DIR "@MUTEX_DIR@"
 
 /* version stuff */
-extern const char * const mp_git_sha;
 extern const int mp_version_major;
 extern const int mp_version_minor;
 extern const int mp_version_patch;
diff --git a/src/include/mp_version.h b/src/include/mp_version.h
index 4b3a494..5ed83a1 100644
--- a/src/include/mp_version.h
+++ b/src/include/mp_version.h
@@ -10,5 +10,3 @@
 #define MP_VERSION_MINOR 5
 #define MP_VERSION_PATCH 0
 
-#define STR(x) #x
-#define MP_VERSION_STRING(maj, min, p) STR(maj) "." STR(min) "." STR(p)
-- 
2.6.2