Building gnustep-back-0.8.5

[Liam Whalen]

Now I'm having difficulty building gnustep-back-0.8.5
here is my error

make[2]: Entering directory `/usr/local/src/gnustep-back-0.8.5/Source/gsc'
Making all for subproject gsc...
 Compiling file GSContext.m ...
GSContext.m:26:37: warning: AppKit/AppKitExceptions.h: No such file or
directory
GSContext.m:27:38: warning: AppKit/NSAffineTransform.h: No such file or
directory
GSContext.m:28:28: warning: AppKit/NSColor.h: No such file or directory
GSContext.m:29:27: warning: AppKit/NSView.h: No such file or directory
GSContext.m:30:29: warning: AppKit/NSWindow.h: No such file or directory
GSContext.m:31:36: warning: AppKit/GSDisplayServer.h: No such file or
directory
In file included from GSContext.m:41:
../../Headers/gsc/GSContext.h:31:38: warning: AppKit/NSGraphicsContext.h:
No such file or directory
In file included from GSContext.m:41:
../../Headers/gsc/GSContext.h:44: cannot find interface declaration for
`NSGraphicsContext', superclass of `GSContext'
make[3]: *** [shared_obj/ix86/linux-gnu/gnu-gnu-gnu/GSContext.o] Error 1
make[2]: *** [gsc.all.subproject.variables] Error 2
make[2]: Leaving directory `/usr/local/src/gnustep-back-0.8.5/Source/gsc'
make[1]: *** [libgnustep-back.all.bundle.variables] Error 2
make[1]: Leaving directory `/usr/local/src/gnustep-back-0.8.5/Source'
make: *** [internal-all] Error 2

which looks to me like there are a bunch of files missing and that the
file GSContext.h s missing the decleration of NSGraphicsContext?

What can be done to work around this?

Liam