From f2bf43c952de46a1e358d37fad2b205d7e5e7db0 Mon Sep 17 00:00:00 2001
From: Markus Frank <Markus.Frank@cern.ch>
Date: Fri, 24 May 2019 17:16:06 +0200
Subject: [PATCH] Allow for dd4hep units in material tables

---
 examples/CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 1eb931f25..af7b425b4 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -51,12 +51,16 @@ dd4hep_enable_tests (
   ClientTests
   Conditions
   DDG4
-  #OpticalSurfaces
   Persistency
   SimpleDetector
   DDG4_MySensDet
   DDCodex
   )
+if ( "${ROOT_VERSION}" VERSION_GREATER "6.17.00" )
+  dd4hep_enable_tests (
+    OpticalSurfaces
+    )
+endif()
 #
 # XercesC dependent stuff
 if ( DD4HEP_USE_XERCESC )
-- 
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