NXConstantString problem in compiling gnustep-gui

[Jan Trembulak]

I try to compile gnustep on my RedHat 7.1 system (gcc version 2.96).

I successfully compile gnustep-make and gnustep-base, but when I compile 
gnustep-gui (0.7.5 or 0.7.0), I've got error:

.....
Making all for tool make_services...
gmake[3]: Nothing to be done for `internal-tool-all'.
Making all for tool set_show_service...
gmake[3]: Nothing to be done for `internal-tool-all'.
Making all for svc example...
error: NXConstantString (instance)
NXConstantString does not recognize characterAtIndex:
gmake[3]: *** [example.service/Resources/Info-gnustep.plist] Error 1
gmake[2]: *** [example.build] Error 2
gmake[1]: *** [example.all.svc.variables] Error 2
gmake[1]: Leaving directory 
`/home/jano/Install/gstep_070/gnustep-gui-0.7.0/Tools'
gmake: *** [internal-all] Error 2
[jano@janolx gnustep-gui-0.7.0]$ 

How can I correct this error ?

thank you.