Created attachment 372956 [details, diff]
My attempt for a multilib mit-krb5. Please have a look.
Patch looks good to me, but needs multilib openssl for pkinit useflag.
Just to be clear, we have USE-conditional circular dep between openssl and mit-krb5.
+*mit-krb5-1.12.1-r1 (14 May 2014)
+ 14 May 2014; Michał Górny <email@example.com> +mit-krb5-1.12.1-r1.ebuild:
+ Enable multilib support, bug #505004.
p.masked for further testing & review.