Thank you! That worked! Leaving my notes below for posterity: The reason why I've missed recursive call was because I added the library to my project using git submodules via: ``` git submodule add https://gitlab.vci.rwth-aachen.de:9000/OpenMesh/OpenMesh.git ``` After that I should have called the following git command ``` git submodule update --init --recursive ``` which brings the `cmake-library` dependency that has the missing CMake functions! Then I was able to prepare the build setup via ``` cmake .. -DBUILD_APPS=OFF ```` Then OpenMesh can be compiled via ``` cmake --build . ``` for a debug build, which generates `OpenMeshCored.lib` and `OpenMeshToolsd.lib` or via ``` cmake --build . --config Release ``` for a release build, which generates `OpenMeshCore.lib` and `OpenMeshTools.lib`. (These are significantly smaller).