It still needs a sizeable amount of RAM to build (with GCC / -O2), according to the Gentoo ebuilds

(512MB RAM/6GB Disk).
It's a monstrous thing to build, even on a modern Linux desktop

. The libreoffice guys have made some progress on cleaning up the cruft/updating the buildsystem, but it's still as annoying as ever on Gentoo, when it breaks because of a stupid soname bump in an obscure dependency... ^^.