Installation Crystal on CentOS7

Crystal Forum
1

I have a VPS with CentOS 7
When installing Crystal, it is proposed to install the version for el6:
crystal.x86_64 0: 0.23.1-3.el6

Installation passes correctly:
$crystal --version
Crystal 0.23.1 [e2a1389e8] (2017-07-13) LLVM 3.8.1