Error installing X11 libraries

If you have error installing X11 libraries for CentOS 5 or CentOS 6, you may want to check whether you have already installed the correct group. To do a grouplist,

 Do  yum grouplist

# yum grouplist 
Installed Groups:
   Administration Tools
   Authoring and Publishing
   Development Libraries
   Development Tools
   Editors
   GNOME Desktop Environment
   Graphics
   Legacy Network Server
   Legacy Software Development
   Legacy Software Support
   Mail Server
   MySQL Database
   Network Servers
   Office/Productivity
   OpenFabrics Enterprise Distribution
   Printing Support
   Server Configuration Tools
   System Tools
   X Software Development
   X Window System
Available Groups:
   Cluster Storage
   Clustering
   DNS Name Server
   Engineering and Scientific
   FTP Server
   GNOME Software Development
   Games and Entertainment
   Graphical Internet
   Java Development
   KDE (K Desktop Environment)
   KDE Software Development
   KVM
   News Server
   PostgreSQL Database
   Sound and Video
   Text-based Internet
   Web Server
   Windows File Server
   Xen

Do a yum groupinstall "X Software Development"

 # yum groupinstall "X Software Development"