From 63102174324d2e94f4570c261b2f6c7b35de2ffb Mon Sep 17 00:00:00 2001
From: Andre Sailer <andre.philippe.sailer@cern.ch>
Date: Tue, 19 Nov 2024 09:39:02 +0100
Subject: [PATCH] CMake: fix using Geant4 internal clhep

the target is now(?) prefixed with Geant4:: otherwise we get a linking error
---
 cmake/DD4hepBuild.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmake/DD4hepBuild.cmake b/cmake/DD4hepBuild.cmake
index d28959a48..bf53ed204 100644
--- a/cmake/DD4hepBuild.cmake
+++ b/cmake/DD4hepBuild.cmake
@@ -843,7 +843,11 @@ MACRO(DD4HEP_SETUP_GEANT4_TARGETS)
         PROPERTIES
         INTERFACE_INCLUDE_DIRECTORIES "${Geant4_INCLUDE_DIRS}"
       )
-      TARGET_LINK_LIBRARIES(CLHEP::CLHEP INTERFACE G4clhep)
+      if(TARGET Geant4::G4clhep)
+        TARGET_LINK_LIBRARIES(CLHEP::CLHEP INTERFACE Geant4::G4clhep)
+      else()
+        TARGET_LINK_LIBRARIES(CLHEP::CLHEP INTERFACE G4clhep)
+      endif()
 
     else()
       IF(NOT TARGET CLHEP::CLHEP)