I think I should have a folder for OpenGL headers under "C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include", but there isn't one there.
How would I go about adding it? From the Visual Studio installer CD, I've tried "Add or Remove Features", which doesn't give me many options. Just Webtools, VB, C# and C++, and having C++ and C# checked when running it didn't help. I've also tried "Repair/Reinstall", which didn't have any options and didn't help.
So how do I install the OpenGL libraries? I'm pretty sure there should be a "gl" folder under include, and I'd thought it would come from the Visual Studio installer. If at all possible, I'd like to avoid having to entirely uninstall and reinstall Visual Studio.