[PATCH 1/4] AC_CACHE_SAVE: treat x: as an absolute path as well

* lib/autoconf/general.m4 (AC_CACHE_SAVE): Subject.
---
 lib/autoconf/general.m4 |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index 59d204f..77f71d2 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -942,7 +942,7 @@ do
   esac
   # Be sure to have absolute directory names.
   case $ac_val in
-    [[\\/$]]* | ?:[[\\/]]* )  continue;;
+    [[\\/$]]* | ?:[[\\/]]* | ?: )  continue;;
     NONE | '' ) case $ac_var in *prefix ) continue;; esac;;
   esac
   AC_MSG_ERROR([expected an absolute directory name for --$ac_var: $ac_val])
-- 
1.7.3.2