[GRASS5] OpenGL GL/gl.h not found and fftw

[DrakeGis]

Hi,
  I'm compiling grass 5.7.0 from the sources and I'm unable to find how to
include OpenGL.
   I tried "--with-opengl-includes=/usr/X11R6/include/" because gl.h
"lives" in /usr/X11R6/include/GL/ but I received a message that gl.h is
not available.
   I'm using Debian SID, and I also have the xlibmesa packages installed
on my system.
   Does anybody knows which are the correct flags ?

   By the way I'm very curious about what is for "fftw".

   Thanks

     D.


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