求救: 48: forward declaration of `struct QButtonGroup 就是这个 [复制链接]

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g++ 6-2.cpp -I/usr/local/qt/include -I/usr/X11R6/include -L/usr/X11R6/lib -L/usr/local/qt/lib -lqt -lGLU -lGL -lXmu -lpthread -Wall -W -O2 -fno-strength-reduce
6-2.cpp: In constructor `MyMainWindow::MyMainWindow()':
6-2.cpp:20: invalid use of undefined type `struct QButtonGroup'
/usr/local/qt/include/qbutton.h:48: forward declaration of `struct QButtonGroup
  '
6-2.cpp:21: invalid use of undefined type `struct QButtonGroup'
/usr/local/qt/include/qbutton.h:48: forward declaration of `struct QButtonGroup
  '
6-2.cpp:21: parse error before `(' token
6-2.cpp:23: no matching function for call to `QRadioButton::QRadioButton(const
  char[9], QButtonGroup*&)'
/usr/local/qt/include/qradiobutton.h:77: candidates are:
  QRadioButton::QRadioButton(const QRadioButton&)
/usr/local/qt/include/qradiobutton.h:54:          
  QRadioButton::QRadioButton(const QString&, QWidget*, const char* = 0)
/usr/local/qt/include/qradiobutton.h:53:          
  QRadioButton::QRadioButton(QWidget*, const char* = 0)
6-2.cpp:26: no matching function for call to `QRadioButton::QRadioButton(const
  char[9], QButtonGroup*&)'
/usr/local/qt/include/qradiobutton.h:77: candidates are:
  QRadioButton::QRadioButton(const QRadioButton&)
/usr/local/qt/include/qradiobutton.h:54:          
  QRadioButton::QRadioButton(const QString&, QWidget*, const char* = 0)
/usr/local/qt/include/qradiobutton.h:53:          
  QRadioButton::QRadioButton(QWidget*, const char* = 0)
6-2.cpp:29: no matching function for call to `QRadioButton::QRadioButton(const
  char[9], QButtonGroup*&)'
/usr/local/qt/include/qradiobutton.h:77: candidates are:
  QRadioButton::QRadioButton(const QRadioButton&)
/usr/local/qt/include/qradiobutton.h:54:          
  QRadioButton::QRadioButton(const QString&, QWidget*, const char* = 0)
/usr/local/qt/include/qradiobutton.h:53:          
  QRadioButton::QRadioButton(QWidget*, const char* = 0)
6-2.cpp:32: invalid use of undefined type `struct QButtonGroup'
/usr/local/qt/include/qbutton.h:48: forward declaration of `struct QButtonGroup
  '
6-2.cpp:33: invalid use of undefined type `struct QButtonGroup'
/usr/local/qt/include/qbutton.h:48: forward declaration of `struct QButtonGroup
  '
6-2.cpp:34: invalid use of undefined type `struct QButtonGroup'
/usr/local/qt/include/qbutton.h:48: forward declaration of `struct QButtonGroup
  '
make: *** [all] Error 1

楼主要说什么？

这样说帮不上什么忙的。看看这个提示，你看看6-2.cpp中21行代码是什么？
6-2.cpp:21: invalid use of undefined type `struct QButtonGroup'