How can I finish a basement bathroom where the toilet plumbing is 12 inches from the foundation wall?

So I have a drain pipe that is 12 inches from the foundation wall. Every shower floor pan I have looked at says you need 12 inches from the center of the drain to the wall. I was planning on framing this bathroom and putting up drywall.

So for this particular wall, do I just put up furring strips so I can attach the shower wall up? Or what can I do? If I frame, the wall will then be like 8 inches from center which won't work.