Several people have it going on x64 Linux already:
http://monkeycoder.co.nz/forums/topic/compiling-on-ubuntu-14-04-lts-fresh-instal...
http://monkeycoder.co.nz/forums/topic/compiling-on-ubuntu-14-04-lts-fresh-instal...
Feel free to ask questions in the forums (or here, but there are more people at forums).