diff --git a/stella/configure b/stella/configure
index c9aa1ecbd..8db8f09af 100755
--- a/stella/configure
+++ b/stella/configure
@@ -316,11 +316,11 @@ for ac_option in $@; do
       --mandir=*)
         _mandir=`echo $ac_option | cut -d '=' -f 2`
         ;;
-#      *)
-#        echo "error: unrecognised option: $ac_option
-#Try \`$0 --help' for more information." >&2
-#        exit 1
-#        ;;
+      *)
+        echo "warning: unrecognised option: $ac_option
+Try \`$0 --help' for more information." >&2
+        sleep 2
+        ;;
     esac;
 done;