There seems to be a mistake with masking regarding to openttd. If you look at http://packages.gentoo.org/search/?sstring=openttd it lists 0.4.7 as M+ for x86 although the changelog states that 0.4.7 is stable as of 28.5.06. I have openttd in package.keywords set to install unstable, so it must have been ~x86 before that. Could you look into that? Thanks
$ grep -C2 openttd /usr/portage/profiles/package.mask # Chris Gianelloni <wolf31o2@gentoo.org> (29 May 2006) # Masked for security reasons. See bug #131010 for more info. >=games-simulation/openttd-0.4.7