mkdir /tmp/ruby && cd /tmp/ruby
 curl -L --progress http://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.4.tar.bz2 | tar xj
 cd ruby-2.3.4
 ./configure --disable-install-rdoc
 make -j`nproc`
 sudo make install
 sudo gem install rake bundler foreman --no-ri --no-rdoc