perl-libnet from powertools says:

error: failed dependencies:
        perl >= 5.00503 is needed by perl-libnet-1.0703-3
(and perl 5.6 doesn't seem to satisfy as such)

proprietary backup software, legato networker says:

error: failed dependencies:
	libncurses.so.3.0 is needed by lgtoclnt-rh-5.1.0-2

Putting both of these to comps file yields a failure in dependencies screen
with 'no suggestion'.

The actual failures aren't written anywhere.  I'd expect these to be seen
in install.log and ALT-F? screen, at least.
 
Fresh TUI install, if it makes any difference.