[MXE] build errors (GL_MULTISAMPLE etc not found)

[PhilipNienhuis]

Hi,

While trying to a cross-build a recent octave-4.1.0+ I get compile errors
(relating to core Octave cs be8d7721ac16 "Use OpenGL line smoothing when
multisample is not found"):

: 
..../gl-render.cc:647:17: error: 'GL_MULTISAMPLE' was not declared in this
scope  
      glEnable (GL_MULTISAMPLE);
:
..../gl-render.cc:649:22: error: 'GL_SAMPLE_BUFFERS' was not declared in
this scope
       glGetIntegerv (GL_SAMPLE_BUFFERS, &iMultiSample);
:
.../gl-render.cc:650:22: error: 'GL_SAMPLES' was not declared in this scope
       glGetIntegerv (GL_SAMPLES, &iNumSamples);
:

A few minute before, that same octave-4.1.0+ was built fine for (and runs
fine in) linux, all I did after that was "make all dist", copy that into
mxe-octave, fix the checksums, and start an mxe build.

Comparing my system's  /usr/include/GL/gl.h  with  mxe's 
<mxe-octave>/usr/usr/i686-w64-mingw32/include/GL/gl.h  I can confirm that
definitions for GL_MULTISAMPLE etc are lacking in the latter. 

(A little surprising to me as my linux build system (Mageia-2) is a bit old,
the octave build dependencies are the distro-supplied ones and I figured in
MXE the various build tools & dependencies would be more up-to-date.)

OK, my mxe build tree isn't bleeding edge (~5 weeks old,  578:583d3bf548e6
"texinfo: update to 5.2 and install all tools"). But in later changesets I
didn't spot opengl-related updates.

Phliip



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