fix linking issue

Author: sawenzel

macro/CMakeLists.txt

@@ -125,6 +125,7 @@ endif()
 o2_add_test_root_macro(build_geometry.C
                        PUBLIC_LINK_LIBRARIES O2::SimConfig
                                              O2::DetectorsPassive
+                                             O2::ExternalDetectors
                                              O2::Field
                                              O2::MFTSimulation
                                              O2::MCHSimulation
@@ -184,6 +185,7 @@ if(Geant4_FOUND AND BUILD_SIMULATION)
 o2_add_test_root_macro(o2sim.C
                        PUBLIC_LINK_LIBRARIES O2::Generators
                                              O2::DetectorsPassive
+                                             O2::ExternalDetectors
                                              O2::Field
                                              O2::MFTSimulation
                                              O2::MCHSimulation