Gentoo today stabilized openoffice 3.0. I then emerged it in two systems. OpenOffice 3 now supports parallel building, so there should be a speedup compared with 2.4 in an multi-core system.
x86 laptop: debugging is completely disabled. About 5 GiB.
amd64 desktop: CFLAGS="... -ggdb"; FEATURES="splitdebug". More than 11GiB!