I have installed distcc but apparantly mozilla will not build with that. I suggest defining CC and CXX in the ebuild. I realise there are plenty of ways to work around distcc but it would be even better if the mozilla ebuild would handle it.
this can be applied to more than just mozilla
I have been keeping up with distcc for quite some time and have distcc setup across 4 machines. As a matter of fact I just built mozilla 1.1 yesterday and had 3 machines maxed at 100% using distcc. Are u using distcc-0.12? and u will get much better results if u use CC="ccache distcc gcc" and CXX="ccache distcc g++" If your having problems with getting the pre-processed code passing to the client machines try adding them twice to DISTCC_HOSTS and adding localhost last. Anyway just emerged a fresh system with distcc across 2 XP1800 machines, and a 1.2 athlon with -j10 without a ccache in 37 mins with no hiccups :)
I just found out it actually does compile with distcc. Thanks for the extra help Brad, it was really appreciated. :)