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INSTALL 파일에 나와있다
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By default the ProFTPD files will be installed as user 'root' and the
first group with gid 0 listed in /etc/group, usually 'root' or 'wheel'.
If you wish to install using a different user or group ownership, set
the install_user and install_group environment variables before running
configure. Using a Bourne-ish style shell (e.g. sh, ksh, bash), you can
do this on the command line like this:
$ install_user=root install_group=wheel ./configure
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하지만 실행은 반드시 root 만~~
http://www.proftpd.org/docs/faq/linked/faq-ch4.html#AEN253
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2. "inet_create_connection() failed: Operation not permitted".
You aren't starting ProFTPD as root, or you have inetd configured to run ProFTPD as a user other than root. The ProFTPD daemon must be started as root in order to bind to tcp ports lower than 1024, or to open your shadow password file when authenticating users. The daemon switches uid/gids to the user and group specified by the User/Group directives during normal operation, so a "ps" will show it running as the user you specified.
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