--- a/test/configure2	Sun Dec 15 14:50:19 2024 +0100
+++ b/test/configure2	Sun Dec 15 14:56:05 2024 +0100
@@ -754,6 +754,11 @@
             ERROR=1
             DEPENDENCIES_FAILED="option 'toolkit' $DEPENDENCIES_FAILED"
         fi
+    else
+        echo
+        echo "Invalid option value - usage:"
+        echo "  --toolkit=(gtk3|cli|gtk2|wpf)"
+        abort_configure
     fi
 fi