yin ~ # equery d kth-krb
[ Searching for packages depending on kth-krb... ]
net-ftp/yafc-1.1.1 (krb4? app-crypt/kth-krb)
net-misc/curl-7.15.5 (krb4? app-crypt/kth-krb)
yin ~ # emerge -vp yafc curl

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

Calculating dependencies... done!
[ebuild   R   ] net-ftp/yafc-1.1.1  USE="readline -kerberos -krb4* -socks5" 0 kB 
[ebuild   R   ] net-misc/curl-7.15.5  USE="kerberos ssl -ares -gnutls -idn -ipv6 -krb4 -ldap -test" 0 kB Total: 2 packages (2 reinstalls), Size of downloads: 0 kB
yin ~ #