Hello, mesa-libGLw has been introduced in RHEL 6.2, while it is provided by ELGIS (for GRASS). https://rhn.redhat.com/errata/RHEA-2011-1714.html Until we test the version provided by base and remove the one currently on ELGIS, users upgrading to EL 6.2 may have to exclude one version or the other from their repo files. Cheers, Mathieu