hi to all, i've Qt 5.7 in Centos 7 in VM, i am trying to build small program.
Qt Code: 
  1. #include "mymainwindow.h"
  2. #include <QApplication>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication a(argc, argv);
  7.     MyMainWindow w;
  8.     w.show();
  9.  
  10.     return a.exec();
  11. }
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in qwidget.h :-
Qt Code: 
  1. public Q_SLOTS:
  2.     // Widget management functions
  3.  
  4.     virtual void setVisible(bool visible);
  5.     void setHidden(bool hidden);
  6.     void show(); // <-- here is showing error
  7.     void hide();
  8.  
  9.     void showMinimized();
  10.     void showMaximized();
  11.     void showFullScreen();
  12.     void showNormal();
  13.  
  14.     bool close();
  15.     void raise();
  16.     void lower();
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