OT: FoundationKit Headers for NeXTStep 3.3

[J . Aaron Pendergrass]

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Hi,
I'm trying to port an app from Cocoa/GNUstep back to NeXTStep 3.3.  The 
app makes use of numerous foundation kit classes (most notably 
NSURLFileHandle which may or may not exist at all for NeXTStep), I have 
downloaded & installed the Foundation kit user package from apple's 
archives, but I still need header files to do development.
Do these exist anywhere (are they free??)?
If not how difficult do people think it is likely to be to convince the 
GNUstep foundation to work on NeXTStep?

Thanks
aaron
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