А>#include <QApplication>
А> #include <QPushButton>
А> #include <QMacStyle>

А> int main(int argc, char *argv[])
А> {
А>     QApplication app(argc, argv);
А>     QApplication::setStyle(QMacStyle);
А>     QPushButton hello("Hello world!");
А>     hello.resize(100, 30);
А>     hello.show();
А>     return app.exec();
А> }
А>

А>$ qmake-qt4 -project && qmake-qt4 && make
А>g++ -c -pipe -O2 -Wall -W -D_REENTRANT  -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -I. -o main.o main.cc
А>main.cc:3:22: error: QMacStyle: No such file or directory
А>main.cc:13:3: warning: no newline at end of file
А>main.cc: In function 'int main(int, char**)':
А>main.cc:8: error: 'QMacStyle' was not declared in this scope
А>make: *** [main.o] Ошибка 1
А>