Problem with GUI

[Germán Arias]

Currently I can't compile GUI because I get the error:

In file included from GSSpeechEngine.h:1,
                 from GSSpeechEngine.m:1:
/usr/GNUstep/Local/Library/Headers/Foundation/Foundation.h:47:34: error:
Foundation/NSCalendar.h: No such file or directory
make[5]: *** [obj/GSSpeechServer.obj/GSSpeechEngine.m.o] Error 1
make[4]: *** [internal-app-run-compile-submake] Error 2
make[3]: *** [GSSpeechServer.all.app.variables] Error 2
make[2]: *** [internal-all] Error 2
make[1]: *** [internal-all] Error 2
make: *** [internal-all] Error 2

Some idea?