javafx: XQuartz on Mac

when JavaFX doesn't work over X11 forwarding on Mac, how to fix it

When using X11 forwarding over XQuartz on Mac, JavaFX programs sometimes result in the following error:

-bash-4.3$ java HelloJavaFX 
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  149 (GLX)
  Minor opcode of failed request:  24 (X_GLXCreateNewContext)
  Value in failed request:  0x0
  Serial number of failed request:  28
  Current serial number in output stream:  29
-bash-4.3$

This magic command line that you run at the Mac command line seems to fix the problem, as suggested by this internet discussion, which referenced this other bug report

defaults write org.macosforge.xquartz.X11 enable_iglx -bool true

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