I can't emerge faad2, because the latest version of faad2 depends on libmp4v2, which in turn depends on an older version of faad2, which is blocked: ~ # emerge -pv faad2 These are the packages that would be merged, in order: Calculating dependencies... done! [blocks B ] <media-libs/faad2-2.0-r9 (is blocking media-libs/libmp4v2-1.4.1) [ebuild N ] media-libs/libmp4v2-1.4.1 4,678 kB [ebuild U ] media-libs/faad2-2.0-r11 [2.0-r3] USE="(-xmms%)" 8 kB Total size of downloads: 4,687 kB ~ # emerge faad2 Calculating dependencies... done! !!! Error: the <media-libs/faad2-2.0-r9 package conflicts with another package; !!! the two packages cannot be installed on the same system together. !!! Please use 'emerge --pretend' to determine blockers. For more information about Blocked Packages, please refer to the following section of the Gentoo Linux x86 Handbook (architecture is irrelevant): http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked ~ # emerge --pretend '<=media-libs/faad2-2.0-r9' These are the packages that would be merged, in order: Calculating dependencies !!! All ebuilds that could satisfy "<=media-libs/faad2-2.0-r9" have been masked. !!! One of the following masked packages is required to complete your request: - media-libs/faad2-2.0-r7 (masked by: ~amd64 keyword) For more information, see MASKED PACKAGES section in the emerge man page or refer to the Gentoo Handbook.
emerge -C \<media-libs/faad2-2.0-r9