You cannot install Firefox 4 in profile default/linux/amd64/10.0/desktop by default due to missing USE=apng on libpng: ============================================================= emerge: there are no ebuilds built with USE flags to satisfy "media-libs/libpng[apng]". !!! One of the following packages is required to complete your request: - media-libs/libpng-1.4.7 (Change USE: +apng) (dependency required by "www-client/firefox-4.0.1-r1" [ebuild]) (dependency required by "www-client/firefox" [argument]) ============================================================= Please fix.
+ 27 Sep 2011; Samuli Suominen <ssuominen@gentoo.org> + targets/desktop/package.use: + Enable USE="apng" for media-libs/libpng by default wrt #372419 by Sebastian + Pipping