#!/usr/bin/env ruby
require 'mkmf'
arch = RbConfig::expand(CONFIG["arch"])
distro = if File.exist?("/etc/os-release")
# this is "", "CentOS" or "Ubuntu"
`egrep "^ID=.*" /etc/os-release`.split("=")[1].downcase
end
unless %w[centos ubuntu fedora].include?(distro.to_s.chomp)
STDERR.puts "unhandled /etc/os-release result: #{distro}"
end
# either <arch> or <arch>_<distro> if distro is non-null
puts [arch, distro].compact.join("_")