New answers tagged glut
3
glGenerateMipmap is an extension, unless you are using OpenGL 3 or above (I think). You probably want to use a library like GLEW to load it.
See OpenGL Extensions for more information about extensions in OpenGL. Many things that were extensions in 2.x were promoted to the core API in versions 3 and 4, but unless you upgrade to those versions, you'll have to ...
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