Build instructions (Linux):
Requires: build-essential, qt4-default, git
git clone https://github.com/FusionLauncher/LibFusion
cd LibFusion
qmake && make
cd ..
git clone https://github.com/FusionLauncher/FusionUpdater
cd FusionUpdater
qmake && make
LD_LIBRARY_PATH=../LibFusion ./FusionClientUpdater