The pkinit plugin blindly assumes libdl and fails to link. Upstream has a ticket, but I'm unsure how quickly it will be resolved. Understandably, upstream fixing this through autoconf would be the right thing to do, but attached is a bandage patch that suffices for the moment. Also adding a patch to mit-krb5-1.6.3-r1.ebuild to actually apply the patch - again, it doesn't fit perfectly within the existing approach, but it works for my one-off environment.
Created attachment 150853 [details, diff] libdl patch
Created attachment 150854 [details, diff] ebuild patch
Hi. Sorry if nobody followed through on this bug. Upstream marked your bug report as fixed. Let's in turn mark this one as fixed as well.