AuthBind config for TeamCity 10

I'm trying to bind TeamCity to port 80 on Ubuntu 14.04, and have encountered the permissions issue related to low port numbers and non-root users. I've trying to follow a solution that involves using authbind, but I'm struggling to find the equivalent location of /etc/default/tomcat7 in TeamCity.

http://stackoverflow.com/a/23547702/665800

I also tried to put the AUTHBIND=yes property into /opt/TeamCity/conf/setenv.sh as an export, but it didn't seem to make any difference.