--- a/python/mozbuild/mozbuild/configure/__init__.py
+++ b/python/mozbuild/mozbuild/configure/__init__.py
@@ -421,7 +421,7 @@
         # All options should have been removed (handled) by now.
         for arg in self._helper:
             without_value = arg.split('=', 1)[0]
-            raise InvalidOptionError('Unknown option: %s' % without_value)
+            # raise InvalidOptionError('Unknown option: %s' % without_value)

         # Run the execution queue
         for func, args in self._execution_queue: