?Qué versión de Red Hat estás usando? Al menos aquí en Fedora 9, se puede instalar Grass desde repositorios sin problemas:
Código:
[christian@localhost ~]$ sudo yum search grass
Loaded plugins: refresh-packagekit
====================================================================== Matched: grass =======================================================================
grass.i386 : GRASS - Geographic Resources Analysis Support System
grass-devel.i386 : GRASS (Geographic Resources Analysis Support System) development headers
grass-libs.i386 : GRASS (Geographic Resources Analysis Support System) runtime libraries
qgis-grass.i386 : GRASS plugins for qgis
[christian@localhost ~]$