use git describe to get the tag+version

comptime.sh

@@ -5,7 +5,7 @@ if [ x"$1" != x ]; then
 fi
 
 versiongit() {
-	gitversion=`git svn log HEAD --limit=1 --oneline | cut -f 1 -d " "`
+	gitversion=`git describe`
 	cat <<EOF > $path/comptime.h
 
 // Do not edit!  This file was autogenerated