diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3bbe6733..dedb409a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,6 +69,8 @@ option(INTROSPECTION "Build with introspection" OFF)
 option(TESTS "Build tests and perform their before install step" OFF)
 option(COVERAGE "Build project with coverage info" OFF)
 set(PIP_UTILS 1)
+set(BUILDING_pip 1 PARENT_SCOPE)
+set(pip_ROOT_SRC "${CMAKE_CURRENT_SOURCE_DIR}" PARENT_SCOPE)
 set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
 set(CMAKE_CXX_STANDARD 11)