I'm running it on an x86 server and it has not eaten a single kitten! (Also it is written in php so there is little chance that it works on amd64 but explodes on x86)
+ 09 Mar 2013; Markos Chandras <hwoarang@gentoo.org> tt-rss-1.5.10.ebuild, + tt-rss-1.5.11.ebuild, tt-rss-1.6.1.ebuild, tt-rss-1.6.2.ebuild, + tt-rss-1.7.0.ebuild: + add ~x86. Bug #458758 +