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Can not include glew.h in multiple files within the same project.

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Not a graphics question per se, but I'm having a hell of a time just getting glew to work. See, I had a project using glew.h as well as other files like SDL_Opengl and glm all contained within main.cpp which I compiled and ran just fine. But now I want to split my project up into more files. The problem is if I include glew.h in one of my header files as well as in my main.cpp I get "multiple definition" errors. If I only include it in one or the other, then I get "function undefined" errors. I have tried including GLEW_STATIC and it seems to have done nothing. I also tried putting all my OpenGL header includes in a separate header file with it's own header locks and #pragma once calls and it still didn't work.

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