When I try to upgrade my system, but I get the error below:

sojia src # emerge -uvDNp worldThese are the packages that I would merge, in order:

Calculating world dependencies …done!
[blocks B ] sys-apps/pam-login (is blocking sys-apps/shadow-4.0.15-r2)
[ebuild U ] sys-apps/shadow-4.0.15-r2 [4.0.14-r1] +nls -nousuid +pam (-selinux) -skey 1,264 kB

Total size of downloads: 1,264 kB

According to this page on http://forums.gentoo.org, the clue is in the shadow ChangeLog:

*shadow-4.0.14-r2 (12 Mar 2006)
12 Mar 2006; Diego Pettenò +files/login.defs,
+files/login.pamd, +shadow-4.0.14-r2.ebuild:
Merge pam-login back into shadow, as 4.x version was already being used;
this means that upgrade from 4.0.14-r1 requires to remove pam-login before.

To solve “emerge -C pam-login && emerge -1 shadow”, this is safe to do.

Update: Thanks Julian. It’s more safe to perform “emerge –buildpkgonly –nodeps shadow && emerge -C pam-login && emerge –usepkgonly shadow“

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