An OpenGL implementation is usually provided with the graphics card driver installation. However, in order to use the vendor provided GL implementation, you usually have to link to a stub implementation. On Linux this is usually libGL.so and on Windows its opengl32.lib( GL calls are forwarded to the correct implementation at runtime provided the appropriate context is created ). For Windows, opengl32.lib is provide with the platform/windows SDK or the compiler installation. There is not specific headers for ATI/Nvidia or any other vendor. The latest headers are provided on the OpenGL website and the libraries are OS dependent and provided by the respective platforms.
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