File reproducible.patch of Package gap

Author: Bernhard M. Wiedemann <bwiedemann suse de>
Date: 2018-01-26
Subject: allow to override build date

to make package build reproducible

code was rewritten upstream

Index: gap4r8/cnf/mkversionheader.sh
===================================================================
--- gap4r8.orig/cnf/mkversionheader.sh
+++ gap4r8/cnf/mkversionheader.sh
@@ -10,7 +10,7 @@ if command -v git >/dev/null 2>&1 ; then
     GAP_BUILD_VERSION=`git describe --tags --dirty || echo`
   fi
 fi
-GAP_BUILD_DATE=`date +"%Y-%m-%d %H:%M:%S (%Z)"`
+GAP_BUILD_DATE=`date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +"%Y-%m-%d %H:%M:%S (%Z)"`
 
 # Generate the file
 cat > "$TMP" <<EOF