yum install epel-release

yum groupinstall "X Window system"

yum groupinstall "MATE Desktop"

systemctl isolate graphical.target; # Tell your system to start the Graphical Interface
unlink /etc/systemd/system/default.target;
ln -s /usr/lib/systemd/system/graphical.target /etc/systemd/system/default.target;

reboot;

you should get a grafical login prompt now

creditz: http://www.45drives.com/wiki/index.php?title=Installing_MATE_on_CentOS_7

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