求助！编译dev-c++ QT时出现错误！ [复制链接]

我是个初学者，刚开始接触QT,我的开发环境是dev-C++..
第一次写helloworld程序就出现了如下错误！不知道怎么解决？请高手们指点！谢谢！

1 C:\Dev-Cpp\projects\main.cpp Qt3Support: No such file or directory.
2 C:\Dev-Cpp\projects\main.cpp QApplication: No such file or directory.
3 C:\Dev-Cpp\projects\main.cpp QLabel: No such file or directory.
C:\Dev-Cpp\projects\main.cpp In function `int main(int, char**)':
7 C:\Dev-Cpp\projects\main.cpp `QApplication' undeclared (first use this function)
  (Each undeclared identifier is reported only once for each  function it appears in.)
8 C:\Dev-Cpp\projects\main.cpp `QLabel' undeclared (first use this function)
8 C:\Dev-Cpp\projects\main.cpp `label' undeclared (first use this function)
8 C:\Dev-Cpp\projects\main.cpp syntax error before `(' token
9 C:\Dev-Cpp\projects\main.cpp `app' undeclared (first use this function)
C:\Dev-Cpp\projects\Makefile.win [Build Error]  [main.o] Error 1

HellowWorld程序如下！

#include <Qt3Support>
#include <QApplication>
#include <QLabel>

int main(int argc, char *argv[])
{
    QApplication app (argc, argv);
    QLabel *label = new QLabel("Hello Qt!", 0);
    app.setMainWidget(label);
    label->show();
    return app.exec();
}

不要用dev-cpp的编译命令，自己在命令行里qmake之后make

你的环境变量等的设置有可能不太对

工程属性里面添加lib以及include的路径