Create iOS Build for iOS 11 with Unity 5.5.4p5

Is the iOS 11 SDK usable with the current Unity Build in 5.5.4p5 ? I tried an empty project with a spinning cube and xcode still spits out the following errors:

UnityMetalSupport.h:20:20: error: typedef redefinition with different types ('NSUInteger' (aka 'unsigned long') vs 'enum MTLPixelFormat')
UnityMetalSupport.h:23:5: error: redefinition of enumerator 'MTLPixelFormatBGRA8Unorm'
MTLPixelFormatBGRA8Unorm,
^

I already excluded Metal from the allowed Graphics APIs in the Player...

Create iOS Build for iOS 11 with Unity 5.5.4p5