Hi, I installed ViDI on Pharo 4 following the project instructions detailed in its GitHub page: Gofer new smalltalkhubUser: 'YuriyTymchuk' project: 'Configuration'; configurationOf: 'Vidi'; load. #ConfigurationOfVidi asClass loadStable When I launch the ViDI option I get the error: "Error: glx not supported". I'm using Gentoo Linux with NVidia Optimus graphic card, so I use bumblebee to switch to NVidia and launched pharo using optirun command like this: $ optirun pharo-ui my-image I get glxspheres64 running successfully using the same procedure. How can I activate GLX support inside the Pharo image? I noted the option System > Settings > FFI > "Path to OpenGL library (on linux)" however I don't see (or I don't know) how to set this value. Thank you.