We are using BuildStream to export a flatpak application but the build system is indeed CMake with both Clang and GCC compiling the project without warnings.
Feel free to open an issue[1] on the project repository to further discuss about a MacOS port :)
Feel free to open an issue[1] on the project repository to further discuss about a MacOS port :)
[1]: https://gitlab.com/squey/squey/-/issues/new