app-office/libreoffice-4.2.3.3-r1 fails to build with >=dev-libs/icu-53. Ebuild should apply patch from upstream. https://bugs.freedesktop.org/show_bug.cgi?id=77071
Created attachment 376530 [details, diff] libreoffice-4.2.3.3-icu-53.patch
It was fixed in 4.2.5.