Seems like they are not designed to be perfect :(
Created attachment 213565 [details] Build log
+ 01 Aug 2012; Justin Lecher <jlec@gentoo.org> tree-puzzle-5.2.ebuild, + +files/tree-puzzle-impl-dec.patch: + Mask stupid test, which fails due to precision reached depending on + optimization used at compile time, #297646; fix move to EAPI=4, #429354 +