--- /tmp/configure	1999-11-17 12:09:38.000000000 -0800
+++ ./configure	2003-03-02 20:10:38.000000000 -0800
@@ -1836,7 +1836,8 @@
 
 
     if test $BISON != "error"; then
-	bison_version=`$BISON --version | sed 's/^.*version 1.//g'`
+	bison_version=`$BISON --version | sed -ne 's/^.*\(version\|(GNU Bison)\) 1\.//p'`
+
 	if test `echo $bison_version | sed 's/\..*$//g'` -lt 25; then
 	    
     echo "configure: warning: Your bison is a bit old (1.$bison_version). You might have to install 1.25" 1>&2