# File lib/pkg-config.rb, line 365
  def have_package(pkg, major = nil, minor = 0, micro = 0)
    message = "#{pkg}"
    unless major.nil?
      message << " version (>= #{major}.#{minor}.#{micro})"
    end
    major ||= 0
    enough_version = checking_for(checking_message(message)) do
      check_version?(pkg, major, minor, micro)
    end
    if enough_version
      libraries = libs_only_l(pkg)
      dldflags = libs(pkg)
      dldflags = (Shellwords.shellwords(dldflags) -
                  Shellwords.shellwords(libraries))
      dldflags = dldflags.map {|s| /\s/ =~ s ? "\"#{s}\"" : s }.join(' ')
      $libs   += ' ' + libraries
      if /mswin32/ =~ RUBY_PLATFORM
        $DLDFLAGS += ' ' + dldflags
      else
        $LDFLAGS += ' ' + dldflags
      end
      $CFLAGS += ' ' + cflags(pkg)
    end
    enough_version
  end