https://www.theshell.guru/install-ruby-2-4-centos-7-3/
yum groupinstall “Development Tools”
yum install epel-release
yum install readline-devel zlib-devel libffi-devel libyaml-devel openssl-devel sqlite-devel
curl -sSL https://rvm.io/mpapis.asc | gpg –import –
curl -L get.rvm.io | bash -s stable
usermod -G rvm <username>
login as user <username>
source /etc/profile.d/rvm.sh
rvm reload
rvm requirements run
rvm list known
rvm install 2.4
rvm use 2.4 –default
gem install sass –no-user-install
PostCSS
npm install –save-dev gulp-postcss
yum install npm