Thanks for the suggestions. I thought updating the display driver sounded good, since this is a very old computer, but when I asked to update the driver it searched for a new driver and eventually said my driver is up to date.
I set LIBGL_ALWAYS_SOFTWARE to 1. That got rid of the WGL error messages, but I still get the other messages: Insufficient GL support error: unable to plot due to insufficient OpenGL support This is harder, because it doesn't tell me _what_ is missing (or "insufficient"). On 26 June 2018 at 16:33, Jon Turney <jon.tur...@dronecode.org.uk> wrote: > On 26/06/2018 20:27, William Mitchell wrote: > >> When I run octave on a fresh installation of cygwin64 on a Windows 7 >> machine, I get the error: >> >> libGL error: required WGL extension WGL_ARB_multisample is missing >> > > This error is coming from the WGL direct renderer built into libGL on > Cygwin, and is telling you that this extension not provided by the Windows > display driver you are using. (This is unusual) > > It's nothing to do with GLEW or any other cygwin libraries. > > Possible solutions: > > Install/upgrade the display driver > > Use software rendering by setting the LIBGL_ALWAYS_SOFTWARE environment > variable > > (See also https://x.cygwin.com/docs/ug/using-glx.html) > > > Insufficient GL support >> error: unable to plot due to insufficient OpenGL support >> >> octave begins running fine. The error occurs when it encounters a plot >> statement. >> >> I have had this problem with an old installation of cygwin for at least a >> year. I finally decided to wipe out cygwin and try a fresh installation. >> This installation contains the "minimal" default packages plus Devel: >> gcc-core, gcc-gfortran, gcc-g++, gdb, mingw64-x86_64-gcc-core, >> mingw64-x86_64-gfortran, mingw64-x86_64-g++; Graphics: gnuplot, >> ImageMagick; Math: bc, grace, octave; Shells: tcsh; X11: everything. >> >> I notice that libGLEW is included in the packages that it installs, which >> is where I would expect to find the WGL extensions. This contains >> /usr/bin/cygGLEW-2-1.dll, but I don't know how to find out what functions >> are in a dll to see if it contains WGL_ARB_multisample. >> >> Any suggestions on what is wrong with this installation are greatly >> appreciated. >> > > -- > Jon Turney > Volunteer Cygwin/X X Server maintainer > -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
