How can I check it? >> I am trying to install GRASS GIS via elgis.repo (see below) on RHEL5 >> (Linux >> wn1.yerphi-cluster.grid.am 2.6.18-274.3.1.el5 #1 SMP Wed Sep 7 10:51:39 >> CEST >> 2011 x86_64 x86_64 x86_64 GNU/Linux) version. > > Do you have the 'Optional' channel enabled? >