Maybe this is because on CentOS cannot be detected ruby version by command ``` RUBYVER=$(shell pkg-config --list-all | grep ruby-2 | tail -1 | cut -f 1 -d " ") ``` On CentOS is exist ``` [root@node0 app_ruby]# pkg-config --list-all | grep ruby ruby Ruby - Object Oriented Script Language ``` not `ruby-2`