$ cmake -S mk/cmake -B bld -G "Ninja Multi-Config" -DCMAKE_C_COMPILER=clang
$ cd bld
$ ninja  # like: -f build-Debug.ninja
$ ninja -f build-Debug.ninja
$ ninja -f build-Release.ninja

$ bld
$ ctest -C Debug                  # run all debug tests
$ ctest -C Release                # run all release tests
$ ctest -C Debug -R ebml          # run debug tests with "ebml" in the name