Histogram fill transparency not working (EPEL7 package)

[Wile_E_Coyote]

Try maybe:

Problems with libGL libraries and ROOT - swrast driver

Good then! I think I got the solution. On mac OSX one should just kill the X server (go to activity monitor, look for the xquartz processes and kill them all), then open a shell and give defaults write org.macosforge.xquartz.X11 enable_iglx -bool true which would set the -iglx option (whatever it means). Then restart the ssh -XY session, and run any GL-based application (such as glxgears). Thank you all for your patience, suggestions and useful help! Cheers! Guido