Problem Using FBTweaks

Anyone encountering problems with AppCode flagging false positives when using Facebook's Tweaks framework?

We're encountering the following messages:

Error:(20, 12) Error after macro substitution: Can't resolve variable '_Generic'
Error:(20, 12) Error after macro substitution: Can't resolve 'currentValue'
Error:(20, 96) Expression expected
Error:(20, 96) Declarator expected
Error:(20, 96) Syntax error

The code builds and runs correctly. XCode does not report any problems.

Any suggestions for dealing with this?