After I did a "emerge --sync" today, "emerge -pvuDN world" showed the following package conflict:
[ebuild U ] sys-fs/e2fsprogs-1.41.2 [1.40.9] USE="nls (-static%)" 4,263 kB
[ebuild N ] sys-libs/e2fsprogs-libs-1.41.2 USE="nls" 479 kB
[blocks B ] sys-libs/ss (is blocking sys-libs/e2fsprogs-libs-1.41.2)
[blocks B ] <sys-fs/e2fsprogs-1.41 (is blocking sys-libs/e2fsprogs-libs-1.41.2)
[blocks B ] sys-libs/com_err (is blocking sys-libs/e2fsprogs-libs-1.41.2)
[blocks B ] sys-libs/e2fsprogs-libs (is blocking sys-libs/ss-1.40.9, sys-libs/com_err-1.40.9)
There is a pretty good discussion in Gentoo Bugzilla.
Actually, I just did the following to resolve the conflict:
# emerge -C ss com_err e2fsprogs e2fsprogs-libs
Then "emerge -pvuDN world" complained no more.

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