# File lib/more/facets/rbsystem.rb, line 196
  def match_platform(arch)
    cpu, os = arch.split '-', 2
    cpu, os = nil, cpu if os.nil? # java

    cpu = case cpu
          when /i\d86/ then 'x86'
          else cpu
          end

    os  = case os
          when /cygwin/ then            [ 'cygwin',  nil ]
          when /darwin(\d+)?/ then      [ 'darwin',  $1  ]
          when /freebsd(\d+)/ then      [ 'freebsd', $1  ]
          when /^java$/ then            [ 'java',    nil ]
          when /^java([\d.]*)/ then     [ 'java',    $1  ]
          when /linux/ then             [ 'linux',   $1  ]
          when /mingw32/ then           [ 'mingw32', nil ]
          when /mswin32/ then           [ 'mswin32', nil ]
          when /openbsd(\d+\.\d+)/ then [ 'openbsd', $1  ]
          when /solaris(\d+\.\d+)/ then [ 'solaris', $1  ]
          else                          [ 'unknown', nil ]
          end

    [cpu, os].flatten.compact.join("-")
  end