Why can I not use the class in $OPIEDIR/include/opie2/o* ?

Hi, I'll pull out all of my hairs. :(

Yesterday I did try to use OFileDialog (with #include <opie2/ofiledialog.h>.
Today I did try to use OProcess (with #include <opie2/oprocess.h>.

Both didn't work because the compiler tells me the that OFileDialog 
(resp. OProcess) is undeclared. Why the hell???

The error message after enter make:
 >>>
g++ -c -pipe  -DQWS -fno-exceptions -fno-rtti  -Wall -W  -O2  
-DOPIE_NO_DEBUG -DOPIE_NO_BUILTIN_SHUTDOWN -DUSE_FILE_NOTIFICATION 
-DOPIE_SOUND_FRAGMENT_SHIFT=16 -DQT_NO_DEBUG 
-I/home/floh/qt-embedded/opie/mkspecs/qws/linux-x86-g++ -I. 
-I/home/floh/qt-embedded/opie/include 
-I/home/floh/qt-embedded/qt-2.3.10/include -I.moc/x86-linux/ -o 
.obj/x86-linux/speech2textImpl.o speech2textImpl.cpp
speech2textImpl.cpp: In member function `virtual void 
speech2textImpl::polish()
   ':
speech2textImpl.cpp:10: error: `OProcess' undeclared (first use this 
function)
speech2textImpl.cpp:10: error: (Each undeclared identifier is reported only
   once for each function it appears in.)
speech2textImpl.cpp:10: error: `myproc' undeclared (first use this function)
speech2textImpl.cpp:10: error: Fehler beim Parsen before `;' token
make: *** [.obj/x86-linux/speech2textImpl.o] Fehler 1
<<<

Could anyone of you tell me, if you ever had success using OFileDialog 
(resp. OProcess)???

I really really really need this OProcess (or QProcess, it doesn't 
matters which of both I'd use).

cu Floh

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#include "speech2textImpl.h"
#include <qapplication.h>
#include <qstring.h>
#include <opie2/oprocess.h>
//#include <opie/ofiledialog.h>

void speech2textImpl::polish()
{
	OProcess *myproc = new OProcess;
}

void speech2textImpl::SaveText_slot()
{

//	QString fileName = OFileDialog::getSaveFileName( "newfile.txt", "Textfiles (*.txt)", this );

}