Okay, here's the deal: I've got perl, mysql, perl-dbi, and mysql-dbd all loaded. The perl-dbi stuff is very dependent upon the build of perl (to the point where I suspect that a rebuild of perl will break DBI unless it, too, is rebuilt in the context of the new perl binary). The same seems to hold true for the mysql-dbd libraries and mysql.
It seems we need a way for a package like perl-dbi to say "don't let perl get updated unless I get updated, too". Do we have that already and nobody's using it, or what? - Joe