Webmin Gentoo module for PostgreSQL shows /var/lib/postgresql/pg_hda.conf as the $PGDATA/pg_hda.conf location for the directory("Path to host access config file", that is, pg_hba.conf. This caused an error message on the Webmin page. Changed this entry to: "/var/lib/postgresql/data/pg_hba.conf" Was able to access and start PostgreSQL then.
try out 1.100 seems to be fixed there
fixed in upstream version