Version:            (using KDE KDE 3.1)
Installed from:    Compiled From Sources
Compiler:          gcc 3.2.1 
OS:          Irix

diff kdebase-3.1/kcontrol/locale/kcmlocale.h kdebase-3.1/kcontrol/locale/kcmlocale.h.orig
2c2
<  * kcmlocale.h
---
>  * locale.h
26,27c26,27
< #ifndef __KCMLOCALE_H__
< #define __KCMLOCALE_H__
---
> #ifndef __LOCALE_H__
> #define __LOCALE_H__

The original fails with the following error:

toplevel.cpp: In constructor `KLocaleApplication::KLocaleApplication(QWidget*, 
   const char*, const QStringList&)':
toplevel.cpp:65: invalid use of undefined type `struct KLocaleConfig'
toplevel.h:36: forward declaration of `struct KLocaleConfig'
toplevel.cpp: In member function 
   `KLocaleApplication::KLocaleApplication(QWidget*, const char*, const 
   QStringList&)':
toplevel.cpp:53: warning: unused parameter `const char*name'
toplevel.cpp: In member function `virtual void KLocaleApplication::save()':
toplevel.cpp:183: invalid use of undefined type `struct KLocaleConfig'
toplevel.h:36: forward declaration of `struct KLocaleConfig'

I've encoutered a few other errors compiling kdelibs and kdebase, but perhaps they are irix-specific.  I'll submit those after I finish compiling everything.  The error above seems like it would be cross-platform.

(I'm using gcc-3.2.1 on irix 6.5)