diff --git a/examples/CLICSiD/CMakeLists.txt b/examples/CLICSiD/CMakeLists.txt
index 2905f2aa6a071ed2e9afa0b024de4be7eec3160e..51b12caac094b21cf0bc1dcf94c70c1602996e53 100644
--- a/examples/CLICSiD/CMakeLists.txt
+++ b/examples/CLICSiD/CMakeLists.txt
@@ -61,14 +61,14 @@ endforeach()
 # ROOT Geometry overlap checks
 dd4hep_add_test_reg( CLICSiD_check_geometry_LONGTEST
   COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_CLICSiD.sh"
-  EXEC_ARGS  checkGeometry --compact=file:$ENV{DD4hepINSTALL}/DDDetectors/compact/SiD.xml
+  EXEC_ARGS  python ${DD4hep_ROOT}/bin/checkGeometry --compact=file:$ENV{DD4hepINSTALL}/DDDetectors/compact/SiD.xml
   # This takes too long                  --full=true --ntracks=10 --option=o --vx=0 --vy=0 --vz=0
   REGEX_PASS " Execution finished..." )
 #
 # ROOT Geometry overlap checks
 dd4hep_add_test_reg( CLICSiD_check_overlaps_LONGTEST
   COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_CLICSiD.sh"
-  EXEC_ARGS  checkOverlaps --compact=file:$ENV{DD4hepINSTALL}/DDDetectors/compact/SiD.xml
+  EXEC_ARGS  python ${DD4hep_ROOT}/bin/checkOverlaps --compact=file:$ENV{DD4hepINSTALL}/DDDetectors/compact/SiD.xml
                     --tolerance=0.1
   REGEX_PASS " Execution finished..." )
 #
@@ -140,7 +140,7 @@ if (DD4HEP_USE_GEANT4)
   # Material scan
   dd4hep_add_test_reg( CLICSiD_DDG4_g4material_scan_LONGTEST
     COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_CLICSiD.sh"
-    EXEC_ARGS  g4MaterialScan --compact=$ENV{DD4hepINSTALL}/DDDetectors/compact/SiD.xml
+    EXEC_ARGS  python ${DD4hep_ROOT}/bin/g4MaterialScan --compact=$ENV{DD4hepINSTALL}/DDDetectors/compact/SiD.xml
                       "--position=0,0,0" "--direction=0,1,0"
     REGEX_PASS " Terminate Geant4 and delete associated actions." )
   #
diff --git a/examples/ClientTests/CMakeLists.txt b/examples/ClientTests/CMakeLists.txt
index 2bf1cc7443daab25dc80b2ea2af608b4c16faf3e..b515c788c5634128bf37d2040ae192e83e7ec4f6 100644
--- a/examples/ClientTests/CMakeLists.txt
+++ b/examples/ClientTests/CMakeLists.txt
@@ -255,7 +255,7 @@ foreach (test Assemblies BoxTrafos CaloEndcapReflection LheD_tracker MagnetField
   if (DD4HEP_USE_GEANT4)
     dd4hep_add_test_reg( ClientTests_g4material_scan_${test}_LONGTEST
       COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_ClientTests.sh"
-      EXEC_ARGS  g4MaterialScan --compact=file:${ClientTestsEx_INSTALL}/compact/${test}.xml
+      EXEC_ARGS  python ${DD4hep_ROOT}/bin/g4MaterialScan --compact=file:${ClientTestsEx_INSTALL}/compact/${test}.xml
                         "--position=0,0,0" "--direction=0,1,0"
       REGEX_PASS " Terminate Geant4 and delete associated actions." )
   endif(DD4HEP_USE_GEANT4)
@@ -276,14 +276,14 @@ foreach (test BoxTrafos CaloEndcapReflection IronCylinder MiniTel SiliconBlock N
   # ROOT Geometry checks
   dd4hep_add_test_reg( ClientTests_check_geometry_${test}_LONGTEST
     COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_ClientTests.sh"
-    EXEC_ARGS  checkGeometry --compact=file:${ClientTestsEx_INSTALL}/compact/${test}.xml
+    EXEC_ARGS  python ${DD4hep_ROOT}/bin/checkGeometry --compact=file:${ClientTestsEx_INSTALL}/compact/${test}.xml
                       --full=true --ntracks=10
     REGEX_PASS " Execution finished..." )
   #
   # ROOT Geometry overlap checks
   dd4hep_add_test_reg( ClientTests_check_overlaps_${test}_LONGTEST
     COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_ClientTests.sh"
-    EXEC_ARGS  checkOverlaps --compact=file:${ClientTestsEx_INSTALL}/compact/${test}.xml
+    EXEC_ARGS  python ${DD4hep_ROOT}/bin/checkOverlaps --compact=file:${ClientTestsEx_INSTALL}/compact/${test}.xml
                       --tolerance=0.1
     REGEX_PASS " Execution finished..." )
 endforeach()
diff --git a/examples/DDG4_MySensDet/CMakeLists.txt b/examples/DDG4_MySensDet/CMakeLists.txt
index 5486e7fdc11b2adc31916446aed79c22a2ed40b0..fabf3bbdf140ea0f629750e388dd78bbbbcff8ed 100644
--- a/examples/DDG4_MySensDet/CMakeLists.txt
+++ b/examples/DDG4_MySensDet/CMakeLists.txt
@@ -45,7 +45,7 @@ if (DD4HEP_USE_GEANT4)
   # Geant4 material scan. From position=0,0,0 to end-of-world 
   dd4hep_add_test_reg( DDG4_MySensDet_g4material_scan_SiliconBlock_LONGTEST
     COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_DDG4_MySensDet.sh"
-    EXEC_ARGS  g4MaterialScan --compact=file:${CMAKE_INSTALL_PREFIX}/examples/ClientTests/compact/SiliconBlock.xml
+    EXEC_ARGS  python ${DD4hep_ROOT}/bin/g4MaterialScan --compact=file:${CMAKE_INSTALL_PREFIX}/examples/ClientTests/compact/SiliconBlock.xml
                "--position=0,0,0" "--direction=0,1,0"
     REGEX_PASS " Terminate Geant4 and delete associated actions."
   )
diff --git a/examples/LHeD/CMakeLists.txt b/examples/LHeD/CMakeLists.txt
index 140df3fa7bb95dc78abecfd9a08aa38d18881ad3..e0824b1654d791cd4740fa65badbcf10bdd21b36 100644
--- a/examples/LHeD/CMakeLists.txt
+++ b/examples/LHeD/CMakeLists.txt
@@ -63,14 +63,14 @@ endforeach()
 # ROOT Geometry overlap checks
 dd4hep_add_test_reg( LHeD_check_geometry_LONGTEST
   COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_LHeD.sh"
-  EXEC_ARGS  checkGeometry --compact=file:${LHeDEx_INSTALL}/compact/compact.xml
+  EXEC_ARGS  python ${DD4hep_ROOT}/bin/checkGeometry --compact=file:${LHeDEx_INSTALL}/compact/compact.xml
   # This takes too long                  --full=true --ntracks=10 --option=o --vx=0 --vy=0 --vz=0
   REGEX_PASS " Execution finished..." )
 #
 # ROOT Geometry overlap checks
 dd4hep_add_test_reg( LHeD_check_overlaps_LONGTEST
   COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_LHeD.sh"
-  EXEC_ARGS  checkOverlaps --compact=file:${LHeDEx_INSTALL}/compact/compact.xml
+  EXEC_ARGS  python ${DD4hep_ROOT}/bin/checkOverlaps --compact=file:${LHeDEx_INSTALL}/compact/compact.xml
                     --tolerance=0.1
   REGEX_PASS " Execution finished..." )
 #
@@ -90,7 +90,7 @@ if (DD4HEP_USE_GEANT4)
   # Material scan
   dd4hep_add_test_reg( LHeD_DDG4_g4material_scan_LONGTEST
     COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_LHeD.sh"
-    EXEC_ARGS  g4MaterialScan --compact=file:${LHeDEx_INSTALL}/compact/compact.xml
+    EXEC_ARGS  python ${DD4hep_ROOT}/bin/g4MaterialScan --compact=file:${LHeDEx_INSTALL}/compact/compact.xml
                       "--position=0,0,0" "--direction=0,1,0"
     REGEX_PASS " Terminate Geant4 and delete associated actions." )
   #