module Hoe::Package

def prerelease_version # :nodoc:
  pre = ENV["PRERELEASE"] || ENV["PRE"]
  return unless pre
  spec.version = "#{spec.version}.#{pre}"
  abort "ERROR: You should format PRE like pre or alpha.1 or something" if
    (Gem::VERSION < "1.4"  and pre !~ /^[a-z]+(\.\d+)?$/) or
    (Gem::VERSION >= "1.4" and pre !~ /^[a-z]+(\.?\d+)?$/)
end