Index: llvm/trunk/utils/lit/tests/lit.cfg
===================================================================
--- llvm/trunk/utils/lit/tests/lit.cfg
+++ llvm/trunk/utils/lit/tests/lit.cfg
@@ -65,6 +65,6 @@
     config.available_features.add('windows')
 
 # Add llvm tools directory if this config is being loaded indirectly
-if config.llvm_tools_dir is not None:
+if getattr(config, 'llvm_tools_dir', None) is not None:
     path = os.path.pathsep.join((config.llvm_tools_dir, config.environment['PATH']))
     config.environment['PATH'] = path