Trying to compile gnustep-gui-0.8.7

[Liam Whalen]

I've been following the instructions for installing the GNUstep system
http://documents.made-it.com/GNUstep/BUILD/

everything went well until I tried to compile gnustep-gui-0.8,7
I have already entered . /usr/GNUstep/System/Makefiles/GNUstep.sh
into the command line then I type make
and I get this error

Making all in Source...
make[1]: Entering directory `/usr/local/src/gnustep-gui-0.8.7/Source'
Making all for library libgnustep-gui...
 Compiling file Functions.m ...
 Compiling file NSActionCell.m ...
 Compiling file NSAffineTransform.m ...
 Compiling file NSApplication.m ...
 Compiling file NSAttributedString.m ...
 Compiling file NSBezierPath.m ...
 Compiling file NSBitmapImageRep.m ...
 Compiling file NSBox.m ...
 Compiling file NSBrowser.m ...
 Compiling file NSBrowserCell.m ...
 Compiling file NSBundleAdditions.m ...
 Compiling file NSButton.m ...
 Compiling file NSButtonCell.m ...
In file included from NSButtonCell.m:39:
/usr/GNUstep/System/Headers/gnustep/base/GSCategories.h:37: cannot find
interface declaration for `NSCalendarDate'
make[2]: *** [shared_obj/ix86/linux-gnu/gnu-gnu-gnu/NSButtonCell.o] Error
1
make[1]: *** [libgnustep-gui.all.library.variables] Error 2
make[1]: Leaving directory `/usr/local/src/gnustep-gui-0.8.7/Source'
make: *** [internal-all] Error 2

I have tried using 'make LD_LIBRARY_PATH=$LD_LIBRARY_PATH'

and I get this error


/usr/GNUstep/System/Makefiles/common.make:137: WARNING: Your PATH may not
be set up correctly !
/usr/GNUstep/System/Makefiles/common.make:138: Please try again after
running ". /usr/GNUstep/System/Makefiles/GNUstep.sh"
rm -rf Headers/AppKit
rm -rf Headers/DPSClient
ln -s gnustep/gui Headers/AppKit
ln -s gnustep/gui Headers/DPSClient
Making all in Source...
make[1]: Entering directory `/usr/local/src/gnustep-gui-0.8.7/Source'
Making all for library libgnustep-gui...
 Compiling file NSButtonCell.m ...
In file included from NSButtonCell.m:39:
/usr/GNUstep/System/Headers/gnustep/base/GSCategories.h:37: cannot find
interface declaration for `NSCalendarDate'
make[2]: *** [shared_obj/ix86/linux-gnu/gnu-gnu-gnu/NSButtonCell.o] Error
1
make[1]: *** [libgnustep-gui.all.library.variables] Error 2
make[1]: Leaving directory `/usr/local/src/gnustep-gui-0.8.7/Source'
make: *** [internal-all] Error 2

which is pretty much the same as the previous error.
What can I do to fix this?

Liam