Index: autoconf/ast_check_pwlib.m4
===================================================================
--- autoconf/ast_check_pwlib.m4	(revision 380027)
+++ autoconf/ast_check_pwlib.m4	(working copy)
@@ -198,7 +198,7 @@
 	fi
 
 	if test "${HAS_$2:-unset}" != "unset"; then
-		$2_VERSION=`grep "$VNAME" ${$2_INCDIR}/$3 | sed -e 's/[[[:space:]]]\{1,\}/ /g' | cut -f3 -d ' ' | sed -e 's/"//g'`
+		$2_VERSION=`grep "$VNAME \"" ${$2_INCDIR}/$3 | sed -e 's/[[[:space:]]]\{1,\}/ /g' | cut -f3 -d ' ' | sed -e 's/"//g'`
 		$2_MAJOR_VERSION=`echo ${$2_VERSION} | cut -f1 -d.`
 		$2_MINOR_VERSION=`echo ${$2_VERSION} | cut -f2 -d.`
 		$2_BUILD_NUMBER=`echo ${$2_VERSION} | cut -f3 -d.`