i'm new to QT. i'm tring to develop my first app on my nokia 5800 xm.
I installed all sdk (Qt SDK 1.1) and tools needed by qt on my windows(xp) desktop.
Then i built a empty qt mobility project where i added only a button.
The project (built on windows) runs without errors on my nokia.

In my project, i want to take an audio stream from microphone device and send
it to an output audio device.
I understood that i can use phonon class for my scope.

I only added on my mainWindow.cpp (at the beginning):
Qt Code: 
  1. #include <phonon/AudioOutput>
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..and on the button action i added:

Qt Code: 
  1. Phonon::AudioOutput* pAudioOutput;
  2.  pAudioOutput = new Phonon::AudioOutput(  Phonon::MusicCategory,  this);
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when i try to build the app i receive the following error:

warning: Can't find following headers in User or System Include Paths:
"audiooutput.h"

but if i go in C:\QtSDK\Symbian\SDKs\Symbian1Qt473\include\phonon i can find the audiooutput.h

What is wrong in my environment?

my easy test project can be downloaded from www.tr3ma.com/Dati/test2.zip