Before you start, read the Mozilla Requirements.
ccache is recommended.
fbuild has been used on 10.4 (Tiger), both PPC and x86. At this time we do not build universal binaries.
Xtools 2.2.1 build server require the cross-compile components
It is highly recommended that you install ccache:
You may have to create a symbolic link to get the building to work properly (esp if you try to build from components and it does not take effect).