/usr/include/qt4/QtGui/qfontdialog.h: In member function ‘void ChatWindow::on_actionSet_font_triggered()’:
/usr/include/qt4/QtGui/qfontdialog.h:78: error: ‘QFontDialog::QFontDialog(QWidget*, bool, Qt::WindowFlags)’ is private
ChatWindow.cpp:1138: error: within this context
ChatWindow.cpp:1143: error: ‘class QFontDialog’ has no member named ‘setCurrentFont’
make: *** [ChatWindow.o] Error 1