Please create and ebuild for latest version Reproducible: Always Steps to Reproduce: 1. 2. 3.
It's not that easy, due to the fact that the database credentials are compiled into the binary, meaning there would have to be a way to get the info to portage before emerging, and everyone's against adding it to make.conf. It's being looked at upstream, see: http://www.zoneminder.com/forums/viewtopic.php?t=3716&highlight=gentoo+ebuild
1.21.2 is in CVS, please test