[PATCH] git-version-gen: allow empty string as --prefix

[Sami Kerola]

There are projects that try use this script, but do not have convention to
use 'v' in front of tags.  Earlier one had to change script default not to
include 'v'.  After this change the --prefix option can be used as last
argument without options in AC_INIT() to achieve the same.
---
 build-aux/git-version-gen | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build-aux/git-version-gen b/build-aux/git-version-gen
index 079849d5e..f493d8157 100755
--- a/build-aux/git-version-gen
+++ b/build-aux/git-version-gen
@@ -101,7 +101,7 @@ while test $# -gt 0; do
   case $1 in
     --help) echo "$usage"; exit 0;;
     --version) echo "$version"; exit 0;;
-    --prefix) shift; prefix=${1?};;
+    --prefix) shift; prefix="${1:-''}";;
     --fallback) shift; fallback=${1?};;
     -*)
       echo "$0: Unknown option '$1'." >&2
-- 
2.11.1