Something

g++ -DHAVE_CONFIG_H -I. -I../../../src -I/usr/portage/distfiles/svn-src/kvirc/kvirc/src/kvilib/include/ -I/usr/portage/distfiles/svn-src/kvirc/kvirc/src/kvirc/include/ -I/usr/include/qt4 -I/usr/include/qt4/Qt/ -I/usr/include/qt4/QtCore/ -I/usr/include/qt4/QtGui/ -I/usr/include -I/usr/include -D_REENTRANT -DREENTRANT -DQT3_SUPPORT -DGLOBAL_KVIRC_DIR=\"/usr/share/kvirc/3.4\" -g -O2 -MT setupwizard.lo -MD -MP -MF .deps/setupwizard.Tpo -csetupwizard.cpp  -fPIC -DPIC -o .libs/setupwizard.o
setupwizard.cpp: In member function 'virtual void KviSetupWizard::showEvent(QShowEvent*)':
setupwizard.cpp:658: error: invalid use of incomplete type 'struct QDesktopWidget'
/usr/include/qt4/Qt/qapplication.h:62: error: forward declaration of 'struct QDesktopWidget'
setupwizard.cpp:659: error: invalid use of incomplete type 'struct QDesktopWidget'
/usr/include/qt4/Qt/qapplication.h:62: error: forward declaration of 'struct QDesktopWidget'
make[4]: *** [setupwizard.lo] Error 1
make[4]: Leaving directory `/usr/portage/distfiles/svn-src/kvirc/kvirc/src/modules/setup'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/usr/portage/distfiles/svn-src/kvirc/kvirc/src/modules'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/portage/distfiles/svn-src/kvirc/kvirc/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/usr/portage/distfiles/svn-src/kvirc/kvirc/src'
make: *** [all-recursive] Error 1