http://docs.fedoraproject.org/en-US/Fedora/20/html/Release_Notes/sect-Releas...
The F20 release notes say that to install E17, one does
yum install @enlightenment
but
sudo yum install @enlightenment Loaded plugins: langpacks, refresh-packagekit Warning: group enlightenment does not exist. Nothing to do
yum grouplist says
Available environment groups: GNOME Desktop KDE Plasma Workspaces Xfce Desktop LXDE Desktop Cinnamon Desktop MATE Desktop Sugar Desktop Environment Development and Creative Workstation Web Server Infrastructure Server Basic Desktop Minimal Install