diff --git a/CMakeLists.txt b/CMakeLists.txt
index 21d7eae..7623065 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -321,6 +321,8 @@ else()
   message(STATUS "Install it to generate API documentation")
 endif()
 
-add_subdirectory(tests)
-add_subdirectory(tool)
-add_subdirectory(docs/spec)
+if(NOT AARU_BUILD_PACKAGE)
+  add_subdirectory(tests)
+  add_subdirectory(tool)
+  add_subdirectory(docs/spec)
+endif()