There should be an example configuration file installed with pure-ftpd.
Ähm, pure-ftpd does not has any configuration file? Its only using start parameters?
Exactly, pure-ftpd does not have a configuration file by itself, only parameters given on the command line You can configure these via the Gentoo configuration file, as explained at the end of the emerge phase: * Before starting Pure-FTPd, you have to edit the /etc/conf.d/pure-ftpd file!