eworm-de/systemd-arch-units — comment on commit a2aa990611122b704b009798d577e80207a79a43
File:  line 0
By unikum:

I think you should add:
EnvironmentFile=/etc/conf.d/apache
ExecStart=/usr/sbin/httpd -k start $OPTIONS
ExecStop=/usr/sbin/httpd -k graceful-stop $OPTIONS
ExecReload=/usr/sbin/httpd -k graceful $OPTIONS