At URL, I committed working unit and tmpfiles.d files inspired by the current unit in systemd and the stuff used by Fedora .
+*apache-2.2.24-r1 (20 May 2013)
+ 20 May 2013; Fabio Erculiani <email@example.com> +apache-2.2.24-r1.ebuild,
+ apache-2.4.4-r3.ebuild, +files/00_systemd.conf,
+ +files/httpd-2.4.3-mod_systemd.patch, +files/apache.conf,
+ +files/apache2.2.service, +files/apache2.4.service:
+ add systemd support to both 2.2 and 2.4 branches on behalf of the systemd
+ team, fix bug #466096, overriding unresponsive maintainer