fix header DetectorDescription/DDCMS

cms-sw · Jun 14, 2018 · 7dfaa7a · 7dfaa7a
1 parent 762bb8a
commit 7dfaa7a
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/DetectorDescription/DDCMS/interface/DDPlugins.h b/DetectorDescription/DDCMS/interface/DDPlugins.h
@@ -19,6 +19,7 @@ namespace dd4hep {
 }
 
 namespace {
+  namespace ns { class xml_h; }
   template <typename P, typename S> class Factory;
   DD4HEP_PLUGIN_FACTORY_ARGS_4( long, dd4hep::Detector*,
 				cms::DDParsingContext*, ns::xml_h*,