Appion

• http://fedoraproject.org/wiki/EPEL
• contains a wealth of packages required for appion

Download repository rpm and install

wget 'http://mirrors.cat.pdx.edu/epel/6/i386/epel-release-6-8.noarch.rpm'
sudo yum --nogpgcheck localinstall epel-release-6-8.noarch.rpm 

Note that release version (6-8) is the current release at the time of this writing. Please visit http://fedoraproject.org/wiki/EPEL/FAQ#How_can_I_install_the_packages_from_the_EPEL_software_repository.3F for more up-to-date information on how to install the packages from the EPEL software repository.