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--- a/configure	2015-04-08 16:27:05.000000000 -0400
+++ b/configure	2015-04-08 16:26:41.000000000 -0400
@@ -5071,7 +5071,7 @@
 else
     { echo "$as_me:$LINENO: checking for version of bison" >&5
 echo $ECHO_N "checking for version of bison... $ECHO_C" >&6; }
-    bison_version=`$BISON --version`
+    bison_version=`$BISON --version |head -n 1`
     { echo "$as_me:$LINENO: result: $bison_version" >&5
 echo "${ECHO_T}$bison_version" >&6; }
     warn_bison=yes