Currently net-im/prosody comes with its own init.d OpenRC script, but it might be advisable to use prosodyctl instead. For example, error reporting using the current init.d script is non-existent, while prosodyctl reports configuration mistakes. Reproducible: Always
Looks like this is already done: http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-im/prosody/files/prosody.initd?r1=1.2&r2=1.3