As I see in:
The version we have in the tree should work with apache-2.4 too
Unless someone has a better idea, why don't we just change "need_apache2_2" to "need_apache2" in the ebuild and see what happens? It's ~arch, and has no maintainer.
+ 18 Dec 2014; Pacho Ramos <email@example.com> 389-admin-1.1.31.ebuild:
+ Should work with 2.4 too as explained at bug #532778