[Qt-interest] "#ifdef unix" usage problem in header file for moc file

[navid navid]

Hello,

when I include a signal definition in header file of sampleclass.cpp: 
#ifdef unix  
  void sampleSignal(int ireport);
#endif

I cant see it in related moc file, and receive 
"undefined reference to `SampleClass::sampleSignal(int)'"
error.

I sure the compiler goes to it, so any syntax error within it, is reported:
#ifdef unix  
  : 
#endif

at the being time, I changed "#ifdef unix" to "#ifndef win32", to overcome the problem.

where is the problem? is it a bug?

I use qt4.6 on ubuntu 9.10 x86

regards
navid