On kernel 2.4.20-gentoo-r6, PIII GRP 1.4 emerging qt-3.2.2 segfaults every time at qbitmap.cpp.
emerge info, cflags, and more information about the crash is needed in order to give you any help here. your best bet is to scale back your cflags, as they're probably too aggressive.
No response - your setup is probably just too aggressive.