I'm really just trying this for the hell of it and without any experience or knowledge, so this is probably a very stupid error.
It fails on the cmake step and I'm left with this the .log file:
The C compiler identification could not be found in "/Volumes/Ext Storage/Trinity/TrinityCore/build/CMakeFiles/3.4.3/CompilerIdC/._CompilerIdC.build"
The CXX compiler identification could not be found in "/Volumes/Ext Storage/Trinity/TrinityCore/build/CMakeFiles/3.4.3/CompilerIdCXX/._CompilerIdCXX.build"
Edit: Derp, turns out doing 'brew install' and then all of the dependencies in one row only installed the last one. After installing each one individually, it now works. Sorry about that ^^
