- libsnorble-2-dev, a C library that the author only distributes as source code and therefore must be compiled from source using CMake
Of the available options, this is easily the best since I can use my own compilation flags to tune the library for my specific target architecture/CPU which can possibly change as the deployment profile for the business case evolves. Assuming it's OSS, I can also fork and adjust the library itself for said "mission-critical" use case.
Also, the Google product being deprecated since '17 is too real π ...