[SOLVED] cmake add boost subproject

Issue

I have recently migrated my project to cmake, and I struggle to build it with my boost dependency in a a subproject. boost is included in my .gitmodules file like this:

[submodule "boost"]
    path = dependencies/boost
    url = https://github.com/boostorg/boost

and in my CMakeFile I include it like this:

add_subdirectory(dependencies/boost)

However, when building, I get the following error:

[cmake] CMake Error at dependencies/boost/CMakeLists.txt:20 (include):
[cmake]   include could not find requested file:
[cmake] 
[cmake]     BoostRoot
[cmake] 

How do I correctly include a dependency in my parent CMakeFile? Which alternatives do you suggest? I would like to have the dependencies as git submodules, so please do not suggest alternatives to that, I would like to transition away from using the system packet manager for that.

Solution

Solved it: Somehow, I forgot to recourse the submodules of boost itself

Answered By - johnworchester

Answer Checked By - Marilyn (WPSolving Volunteer)