--- a/ext/recode/config9.m4
+++ b/ext/recode/config9.m4
@@ -13,6 +13,6 @@
   fi
 
   if test -n "$recode_conflict"; then
-    AC_MSG_ERROR([recode extension can not be configured together with:$recode_conflict])
+    AC_MSG_WARN([recode extension can not be configured together with:$recode_conflict])
   fi
 fi