KURLRequester

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I try to add kurlrequester widget to my app. I work in Kdevelop. I try to do this both, by graphics projected *.ui file and in code:
KURLRequester *xxxx = new KURLRequester (this,"xxxx")

I get the same:
undefined reference to `KURLRequester::KURLRequester(QWidget*, char const*)' (in case ui file, it shows error in auto generated .cpp file from ui)

But when i compiled other project from sources, which used this widget everything is fine. I compared the code (mine and from the projects) it looks equaly.
Have You any idea where is the problem ??

I use Kdevelop 3.3.0 on Kubuntu Breezy with KDE 3.5.0

[toojays]

Have you included the header file for this class?

[SeeLook]

Yes, I done this.
I tryed to declare variable in header, too.
(with class KURLRequester)

I've gived up. I tryed call KFileDialog::getOpenFilename method, but the effect is the same: undefined reference.
All this headers (KURLRequester.h KFileDialog.h) are in the same directory (/usr/include/kde), but with the others (f eg. klineedit) i have no problem.

Could somebody try this in his system
#include <kurlrequester.h>

someclass::someclass {
...
...
KURLRequester *xxxx = new KURLRequester(this,"xxxx");
...
}