module PKGConfig

def have_package(pkg, major=nil, minor=0, micro=0)
  message = "#{pkg}"
  unless major.nil?
    message << " version (>= #{major}.#{minor}.#{micro})"
  end
  major ||= 0
  result = checking_for(checking_message(message), "%s") do
    if check_version?(pkg, major, minor, micro)
      "yes (#{modversion(pkg)})"
    else
      "no"
    end
  end
  enough_version = (result != "no")
  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 /mswin/ =~ RUBY_PLATFORM
      $DLDFLAGS += " " + dldflags
    else
      $LDFLAGS += " " + dldflags
    end
    $CFLAGS += " " + cflags_only_other(pkg)
    if defined?($CXXFLAGS)
      $CXXFLAGS += " " + cflags_only_other(pkg)
    end
    $INCFLAGS += " " + cflags_only_I(pkg)
  end
  enough_version
end