Compilation fails due to missing 'glInvalidateFramebuffer' identifier about magnum HOT 7 CLOSED

It seems that you have too old GLEW (this function is part of OpenGL 4.3, which was added in version 1.9). Try updating it, if possible.

This isn't mentioned in documentation, because I thought that it would cause no issues, as 1.9 isn't too new to not be included as part of regular updates. Actually I want to ditch GLEW altogether and replace it with something more lightweight what can be built directly in the engine. For similar reasons I'm not able to use OpenGL 4.4 functions yet even though it is already supported in some drivers. I'm going to fix this as the first thing when I get some time.

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I'm not sure if it is funny or not, but: apt-cache show libglew-dev | grep Version returns 1.9.0.is.1.8.0-0ubuntu1 on Ubuntu 13.04 :-)

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Yep, that package is 1.8, as it depends on libglew1.8. Even (future) 13.10 has this exact version of GLEW, probably because of this: https://lists.ubuntu.com/archives/ubuntu-devel/2012-November/036123.html. So the only option is to build it from source (or wait until I replace it with something better).

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I replaced GLEW with glLoadGen. The work is in branch glloadgen, no additional dependencies are needed as everything is built in. Didn't put it into master yet, as I need to test it properly, mainly on OpenGL 2.1 hardware. Please try that branch and report if the issue persists.

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Ok, the glloadgen branch compiles fine for me with default CMake options + WITH_SDL2APPLICATION=ON. clang emits an error when compiling with GL_TESTS, but this is unrelated. I open another issue for that.

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Actually, there is an issue when enabling TARGET_GLES:

CMake fails with:

 CMake Error at src/CMakeLists.txt:166 (add_library):
   Objects of target "MagnumGLLoadGenObjects" referenced but no such target
   exists.

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Oops, I overlooked this, fixed. GLLoadGen work is now in master, so closing.

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