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GLWF needs the "server-side" of OpenGL. There are several ways to get it:

• Use software rendering, if you do not need to render much
• Make sure your program uses the X11 server running on the graphics card, not a VNC server or something. If the X11 server is running and unlocked DISPLAY=:0 should be enough.
• The VirtualGL project

With some Nvidia cards, X11 refuses to start without a monitor attached. Maybe there is a similar issue with the Intel card? What helps there is to provide an EDID file in the X11 configuration, see http://kodi.wiki/view/Creating_and_using_edid.bin_via_xorg.conf .

Cheers