If you get the following message while trying to install any package with yum, it means you picked the wrong repo package during install:
Error: xz compression not available
Chances are you installed Epel version 7 on CentOS 6.5
To fix the problem:
Remove the repo cache:
rm -rf /var/cache/yum/x86_64/6/epel
Remove the rpm package itself:
rpm -e epel-release-7-5.noarch
Remove the config files:
rm -rf /etc/yum.repos.d/epel*
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This is another note of the kind: “I don’t want to google for it next time I need it in few years”