Comment # 4 on bug 1127610 from Giacomo Comes

(In reply to Jan Engelhardt from comment #3)
> > PreReq:         pwdutils
> >+PreReq:         shadow
> 
> Isn't this redundant? The only provider of pwdutils is shadow, so
> PreReq:pwdutils should work just like PreReq:shadow.

The correct fix is:
-PreReq:         pwdutils
+PreReq:         shadow
which is what was used.

And PreReq:pwdutils apparently does not work the same as PreReq:shadow,
otherwise there should have been no error during the installation.

See bug 1130588 comment 3 for more details.