First of all, thanks for the good work! And luckily it looks like a trivial issue, but here's the problem:
running "emerge --config =dev-db/mysql-5.5.28" fails after asking for the new root password, because it can't find mysql_install_db in /usr/bin, even though it's in the package and gets installed into /usr/share/mysql/scripts/.
The wrong link is in the mysql-v2.eclass. Unfortunately I cannot work around it from inside the MySQL ebuild.
I would need to copy it from Gentoo's main tree to the overlay — which is no good idea as the eclass will need to be constantly synchronized with Gentoo's. Can I ask you to report this issue on http://bugs.gentoo.org/? Thanks!
Thanks for the reply. There's already a bug for the 5.5 branch since 2011-11. Disgraceful.
vanilla version of eclass/mysql-v2.eclass for patching (see issue #2)
mysql-v2.eclass: correct path for mysql_install_db (closes #2)