Build examples that depend on ExGConfig conditionally

Author: dennisklein

examples/CMakeLists.txt

@@ -16,7 +16,7 @@ if(Geant3_FOUND)
     add_subdirectory(common/gconfig)
   endif()
 
-  if(TARGET FairFastSim)
+  if(TARGET FairRoot::ExGConfig)
     add_subdirectory(simulation/Tutorial1)
   endif()
   add_subdirectory(simulation/Tutorial2)
@@ -28,7 +28,9 @@ if(Geant3_FOUND)
   if(FairMQ_FOUND AND Boost_FOUND)
     add_subdirectory(MQ/parameters)
     add_subdirectory(MQ/serialization)
-    add_subdirectory(MQ/pixelDetector)
+    if(TARGET FairRoot::ExGConfig)
+      add_subdirectory(MQ/pixelDetector)
+    endif()
     add_subdirectory(MQ/pixelAlternative)
     add_subdirectory(MQ/pixelSimSplit)
     add_subdirectory(advanced/Tutorial3)