If your dependencies use CMake or not doesn't really matter, you still end up writing some FindX.cmake file. (Which is a whole other thing with this "modern CM

If your dependencies use CMake or not doesn't really matter, you still end up writing some FindX.cmake file. (Which is a whole other thing with this "modern CMake" by the way: only half of them that come with CMake are "upgraded" to modern and if you don't want to require the absolute latest version, you end up having to check what the FindX script did or redefine stuff manually)