cannot find interface declaration for `NSCalendarDate'

[eani]

when i make gnustep-gui-0.8.7, i get following error: 
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 `/home/eani/Desktop/gnustep-gui-0.8.7/Source'
make: *** [internal-all] Error 2

i have mandrake linux 9.1 system, followed the walkthrough for installing 
gnustep closely so is this a bug or my fault?

can anyone help?

full make output follows attached.


thanks alot

eanï

GNUSTEP GUI
Description: Text document