linux下 Qt 中 OpenGL error: not declared in this scope
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多半是没有装 GLEW，装好GLEW之后，将 #include<GL/glew.h> 添加到所有include之前（不这样的话会报错说 “ gl.h 在 glew.h 之前”），并在 LIBS中添加 -lGLEW 包，有可能需要调用glewInit()函数。可能出现的问题参看StackOverflow：
http://stackoverflow.com/questions/4225554/how-to-use-glew-with-qt
http://stackoverflow.com/questions/8989942/glew-linking-problems-in-qt-creator
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