How do you compile the qt GUI in Linux? I'm trying with just changing this pkgbuild from the AUR to your git instead of the master, and everything works up until running qmake-qt4, where it just spits out the qmake-qt4 usage. It's worked perfectly with /primecoin/primecoin, but not with /mikaelh2/primecoin.

Edit: Figured it out, because there's also a bitcoin-qt-win64.pro, you need to specify "qmake-qt4 bitcoin-qt.pro" rather than just "qmake-qt4" alone.