Is there somewhere that might document how to build gmusicbrowser from the latest source on github for example. I assume youre using make and not cmake?

Well, there is almost nothing to build : )  just the translations.
"make all" or "make locale" will build the translations
"make install" will install the files, though you can also simply run "gmusicbrowser.pl" directly without installation.

Note that building the translations will change the .po files, so if you are doing it from a cloned git repo you'll need to reset the .po files to make git happy, that can be done with the command "git checkout po/*"