xrdb is used in /etc/X11/xinit/xinitrc which belongs to xinit-1.0.1 but xrdb is not an RDEPEND for it. Emerging xorg-x11-7.0.0_rc4 didn't emerge xrdb causing error messages and scite-1.66 to segfault on startup. (Involved in bug #116552 as well?)
Thanks, this is fixed now in 1.0.1.