Invert camera X-axis?

I love games like this and have been looking forward to digging in for a long time, but I am struggling due to the inability to invert the camera controls on the x-axis. Unless I'm missing something while I can invert the y-axis mouse look, there is no way for me to change the x-axis. It's incredibly frustrating, leaves me bumbling around the game unable to do much.

The game has been around for some time, and I really hope that this camera option can be added.
 
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