Hi Philip, thank for your answer. I have searched gl.h include file in my fyle system, and i get this include file both in c:\mingw\include and visual studio path directory. Gl.h comes from visual studio directory contains the extension GL_BGRA_EXT and gl.h that comes from mingw has not. If i compile osg plugins with visual studio i have no problem. So i suppose that mingw must be updated with new opengl include and library.
I have tried to use gl.h and glext.h from visual studio folder in mingw, but mingw gives me error! How i can update mingw to get the right gl extension? I have an nvidia quadro fx 4600 on window xp. bye.
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