hmmm, seems I did have a CoreFoundation.h installed ?? 
```
nix-locate CoreFoundation.h
(haskellPackages.zcache.out)                      2,906 r /nix/store/m45lr9xhns0g65f79n55xrwsqbrrxjfy-swift-corefoundation/Library/Frameworks/CoreFoundation.framework/Versions/A/Headers/CoreFoundation.h
(haskellPackages.SDL-gfx.out)                     3,238 r /nix/store/4lkkk0f7n73s66fg0r5p8srrwhkw4ymy-apple-framework-CoreFoundation/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h
(patchutils.out)                                  3,488 r /nix/store/2ws9cmamvr7xyvdg4d2nnd1bmr1zjrrq-bootstrap-tools/Library/Frameworks/CoreFoundation.framework/Versions/A/Headers/CoreFoundation.h
(mesa_noglu.dev)                                  3,238 r /nix/store/q9xzjg95fgqsd0q71hak95qvma51ik5d-MacOS_SDK-10.12/Library/Frameworks/CoreFoundation.framework/Versions/A/Headers/CoreFoundation.h
```