# check for git short hash
revision=$(cd "$1" && git describe --always 2> /dev/null)
-test "$revision" && revision=git-$revision
# no revision number found
test "$revision" || revision=$(cd "$1" && cat RELEASE 2> /dev/null)
fi
NEW_REVISION="#define LIBAV_VERSION \"$version\""
-OLD_REVISION=$(cat version.h 2> /dev/null)
+OLD_REVISION=$(cat "$2" 2> /dev/null)
# Update version.h only on revision changes to avoid spurious rebuilds
if test "$NEW_REVISION" != "$OLD_REVISION"; then