unable to compile on Windows

[Riccardo Mottola]

Hi,

the recent configure / header changes make it impossible for me to 
compile on windows:

<....>
 Compiling file GSNibLoader.m ...
In file included from G:/GNUstep/GNUstep/include/GNUstepBase/GSConfig.h:229,
                 from 
G:/GNUstep/GNUstep/include/GNUstepBase/GSVersionMacros.h:193,
                 from 
G:/GNUstep/GNUstep/include/Foundation/NSArchiver.h:31,
                 from GSNibLoader.m:30:
G:/GNUstep/GNUstep/include/GNUstepBase/preface.h:112:24: warning: 
objc/objc.h: No such file or directory
G:/GNUstep/GNUstep/include/GNUstepBase/preface.h:116:29: warning: 
objc/objc-api.h: No such file or directory
G:/GNUstep/GNUstep/include/GNUstepBase/preface.h:117:29: warning: 
objc/encoding.h: No such file or directory
 Compiling file NSPasteboard.m ...
In file included from G:/GNUstep/GNUstep/include/GNUstepBase/GSConfig.h:229,
                 from 
G:/GNUstep/GNUstep/include/GNUstepBase/GSVersionMacros.h:193,
                 from G:/GNUstep/GNUstep/include/Foundation/NSArray.h:27,
                 from NSPasteboard.m:522:
G:/GNUstep/GNUstep/include/GNUstepBase/preface.h:112:24: warning: 
objc/objc.h: No such file or directory
G:/GNUstep/GNUstep/include/GNUstepBase/preface.h:116:29: warning: 
objc/objc-api.h: No such file or directory
G:/GNUstep/GNUstep/include/GNUstepBase/preface.h:117:29: warning: 
objc/encoding.h: No such file or directory
 Linking library libgnustep-gui ...
G:\GNUstep\mingw\bin\ld.exe: cannot find -lobjc
collect2: ld returned 1 exit status

Any clues? it happens for almost any file in gui. I updated and 
reconfigured make, base and gui

Riccardo