Cannot run headless capybara-webkit tests from Rubymine!

Interesting problem here, I'm using the capybara-webkit gem for a few of my tests. These work fine in console but while attempting to
run these from Rubymine (and teamcity) I get the following:

Xvfb not found on your system (Headless::Exception)

Anyone able to get these tests running on theirs? please let me know!