Hi all, I'm on # cat /etc/redhat-release Scientific Linux SL release 5.2 (Boron) and I'd like to install some yum groups. So I do yum groupinstall $group and works fine for some: # yum grouplist Loaded plugins: kernel-module Setting up Group Process Installed Groups: Development Libraries Editors Legacy Software Development Mail Server Network Servers PostgreSQL Database System Tools XFS Yum Utilities glite-WN (production - x86_64) But Development Tools seems to not be installed: Available Groups: Administration Tools Authoring and Publishing Cluster Storage Clustering DNS Name Server Development Tools [...] So, I try to install it: # yum groupinstall 'Development Tools' Loaded plugins: kernel-module Excluding Packages from dag Finished Setting up Group Process Package flex-2.5.4a-41.fc6.x86_64 already installed and latest version Package gcc-4.1.2-42.el5.x86_64 already installed and latest version Package redhat-rpm-config-8.0.45-24.el5.noarch already installed and latest version Package strace-4.5.16-1.el5.1.x86_64 already installed and latest version [...] Package cscope-15.5-15.1.el5_3.1.x86_64 already installed and latest version No packages in any requested group available to install or update and the group is still under Avaliable Groups.... Any one could help me to understand why this group does not appear as installed? TIA, Arnau