Unknown CMake command "add_subdirectory_ifdef".

[AlienSarlak]

It seems that the structure of the newer version of Zephyr has changed, making it impossible to compile this sample. While attempting to build, I encountered the following error:

CMake Error at drivers/CMakeLists.txt:4 (add_subdirectory_ifdef):
Unknown CMake command "add_subdirectory_ifdef".

This indicates that the add_subdirectory_ifdef CMake function cannot be found.

I am using:
cmake version 3.22.1

[AlienSarlak]

I think the key point to solve this problem is to add set(ZEPHYR_EXTRA_MODULES "${CMAKE_SOURCE_DIR}/modules") (modify "${CMAKE_SOURCE_DIR}/modules" to your module path)