From 7dfaa7ae3f2bca0aa20f945953e40966026b9b71 Mon Sep 17 00:00:00 2001
From: Mircho Rodozov <mrodozov@cern.ch>
Date: Thu, 14 Jun 2018 14:11:58 +0200
Subject: [PATCH] fix header DetectorDescription/DDCMS

---
 DetectorDescription/DDCMS/interface/DDPlugins.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/DetectorDescription/DDCMS/interface/DDPlugins.h b/DetectorDescription/DDCMS/interface/DDPlugins.h
index 6eb1c0fe47392..7d365f38225cc 100644
--- 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*,