FBSDKCoreKit and the include of non-modular header inside framework module errors

Question

None of the following threads (and many similar) helped me:

Include of non-modular header inside framework module

XCode6: Receiving error "Include of non-modular header inside framework module"

While trying to install the Facebook SDK in my iOS project via cocoapods, I ran into that error:

Inside the FBSDKCoreKit.h header:

Include of non-modular header inside framework module 'FBSDKCoreKit.FBSDKCoreKit'

As I said, I tried the solutions proposed in the answers above without any success.

It's important to mention that this use to work fine on Xcode 7.

Answer 1

Turn on allowing modular headers