Hello, I'm a beginner C++\Qt developer and I want to develop KDE apps. I've decided to use Qt Creator but I've a problem with it. When I add a KDE widget and try to run it, it fails and gives this output:

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/home/utku/Projeler/Progressive/ui_mainwindow.h:43: undefined reference to `KUrlComboRequester::KUrlComboRequester(QWidget*)'

I can't understand where is my mistake. By the way, Qt widgets runs well.

Thanks in advance.

You need to add the appropriate linking instructions to find KDE Libraries.
The easiest way to do this is with CMake. Which build system are you using currently?

bcooksley wrote:Which build system are you using currently?

I'm using QMake. Actually it is default option in Qt Creator.

Unfortunately I do not know the options, but you could try adding "-lkdeui"

If you're using Qt Creator 1.3 (released with Qt 4.6), using cmake is now an option when you create a new project.

Add this to your project file:
LIBS += -L/kde/dir -lkdeui

kernco wrote:If you're using Qt Creator 1.3 (released with Qt 4.6), using cmake is now an option when you create a new project.

OK, thanks. Unfortunately, my distro doesn't support Qt 4.6 ofically yet. I'll try it when I switch to 4.6.

You can use KDevelop4 which supports Qt-4.5 and it handles CMake out of the box (imho better than the current Qt-Creator 1.3) and also QMake. Try KDevelop4 if your distro has it until you can use QtCreator than requires Qt-4.6. And determine which one you like better.

To start a new project you need to tell qtcreator to use the KDE libraries when building. So, choose File -> New... and create your project. We will call it yourproject here. To be able to use KDE's libraries, go to your home directory, cd into yourproject and modify yourproject.pro. Add a line

LIBS += -lkdeui