diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5067c46ebd7..33563c04ac3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -171,7 +171,8 @@ feature_summary(INCLUDE_QUIET_PACKAGES WHAT
   ENABLED_FEATURES DISABLED_FEATURES
 )
 
-if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-  # Only for non super repo builds
+if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR
+    AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE.GPL3-EXCEPT")
+  # Only for opensource, non-super-repo builds
   add_subdirectory(packaging)
 endif()