Emscripten and empty square

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http://stackoverflow.com – I have a small problem that disturbs me after compiling with Emscripten an OpenGL / GLUT code. I can compile with gcc and emcc. I just have a warning about-nostdinc + + Maios under different codes (this has never been a problem for me) Code compiled with gcc works fine. But the generated html page displays only a black square. The code is generated but nothing appears Do you have any idea why? (HowTos)