Attached is an attempt to a bumped ebuild, which works OK here (amd64).
Created attachment 201762 [details] DBD-Pg 2.15.1 ebuild
Created attachment 201766 [details] DBD-Pg 2.15.1 ebuild (fixed deps)
*DBD-Pg-2.15.1 (25 Aug 2009) 25 Aug 2009; Robin H. Johnson <robbat2@gentoo.org> +DBD-Pg-2.15.1.ebuild: Version bump via perl-bump experimental tool.