Some breakage
fatal: reference is not a tree: b15945713e938b76dc9ad9733fd718c36bca16e8
Unable to checkout 'b15945713e938b76dc9ad9733fd718c36bca16e8' in submodule path 'lib/Melanolib/cmake'
Failed to recurse into submodule path 'lib/HttPony'
Failed to recurse into submodule path 'lib/Melanolib'
Also, the build instructions don't include information on cloning the subrepos, and they don't mention to use compile.sh.