Пакет не обновляется при обновлении world

Странную вещь заметил только что:

giant ~ # emerge -pvuDN world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] sys-apps/debianutils-3.2.2 [3.2.1-r1] USE="-static" 135 kB
[ebuild     U ] dev-util/ctags-5.8 [5.7-r2] USE="-ada" 469 kB
[ebuild     U ] dev-util/git-1.6.5.3 [1.6.5.2] USE="blksha1 curl iconv threads webdav -bash-completion -cgi -cvs -doc -emacs -gtk -perl (-ppcsha1) -subversion -tk -xinetd" 2,446 kB
[ebuild     U ] sys-devel/libtool-2.2.6b [2.2.6a] USE="-test -vanilla" 722 kB
[ebuild     U ] x11-apps/xinit-1.2.0-r1 [1.2.0] USE="minimal pam -debug" 0 kB
[ebuild     U ] sys-fs/ntfs3g-2009.11.14 [2009.4.4-r1] USE="hal -debug -external-fuse -suid" 805 kB

Total: 6 packages (6 upgrades), Size of downloads: 4,576 kB
giant ~ # emerge -pv mercurial

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] dev-util/mercurial-1.4 [1.3.1-r1] USE="-bash-completion -bugzilla -emacs -gpg -test -tk -zsh-completion" 1,870 kB

Total: 1 package (1 upgrade), Size of downloads: 1,870 kB
giant ~ #

Почему mercurial не обновляется вместе со всеми?