Hi,
I asked this question some time back and still waiting for some help. As someone who is trying very hard to learn about Osmocom surly there is someone interested in helping me. If not I don't see the point of having this mailing list. We all have to start somewhere.
Anything not from the master branch is not supported
I have no idea where you found where you got that GwmB7UGK.c file but it's _obviously_ broken beyond belief and doesn't stand a chance in hell of compiling.
Cheers,
Sylvain