[ptxdist] [PATCH] configure.ac: change regex for sed version

[Alexander Aring <alex.aring@googlemail.com>]

Change regex for sed version in configure.ac.

This regex will match only on the first line and doesn't
look for a 'version' pattern which is not available in
sed version 4.2.2.

The new regex will match in the first line of 'sed --version' in a pattern
which starts with random character sequence(or zero) followed by whitespace
character and several digits of pattern x.x....x which x is a number.
This pattern will be save in the SED_VERSION variable.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index d4c83b8..4d27a60 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,7 +116,7 @@ if test -z "$SED"; then
 fi
 
 AC_MSG_CHECKING([sed version])
-SED_VERSION=`$SED --version 2>/dev/null | $SED -ne "s/.*version \([[0-9\.]]*\)/\1/p"`
+SED_VERSION=`$SED --version 2>/dev/null | $SED -ne "1 s/.*\s\([[0-9\+\.]]\+\).*/\1/p"`
 case "$SED_VERSION" in
 3.*) AC_MSG_ERROR([we need at least GNU sed 4.x but found $SED_VERSION]) ;;
 4.*) ;;
-- 
1.8.1


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