Bridge from Swift to Objective-C (GNUStep Runtime) via C or other method

[dr_clow]

I am very interested in building a bridge between Swift and GNUStep's 
Objective-C Runtime. 

Given that the Objective-C implementation provided by GNUStep doesn't interact 
directly with Swift as Swift can with Apple's Objective-C runtime, I was 
wondering if there was a way to call into GNUStep from C. If someone could show 
me an example of a way to call into GNUStep using either C as a bride though a 
Swift project or directly from Swift, I would be more than willing to start 
building a bridge. I just don't currently understand how to do it. 

I malignly want to do this so I could more rapidly build software for OnFlapp's 
GNUStep Desktop, but I think this would ultimately benefit everyone.