##############################################################
# extconf.rb for tcltklib
# release date: 2010-05-31
##############################################################
require 'mkmf'

TkLib_Config = {}
TkLib_Config['search_versions'] = 
  # %w[8.9 8.8 8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.6 4.2]
  # %w[8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0]
  %w[8.7 8.6 8.5 8.4 8.0] # to shorten search steps


##############################################################
# use old extconf.rb ?
##############################################################
if with_config('tk-old-extconf')
  require File.join(File.dirname(__FILE__), 'old-extconf.rb')
  exit
end


##############################################################
# check configs
##############################################################
$cleanfiles << 'config_list'
config_list_file = 'config_list'
config_list_file_source = File.join(File.dirname(__FILE__),'config_list.in')
if !File.exist?(config_list_file) || 
    File.ctime(config_list_file_source) > File.ctime(config_list_file)
  old_config_list_file = config_list_file_source
else
  old_config_list_file = config_list_file
end

current_configs = {'with'=>{}, 'enable'=>{}}

# setup keys by config_list.in
IO.foreach(config_list_file_source){|line|
  line.chomp!
  line.lstrip!
  next if line.empty? || line =~ /^\#/ #
  mode, key, value = line.split(/\s+/, 3)
  value ||= ""
  current_configs[mode][key] = value rescue nil
}

# define current value of keys
IO.foreach(old_config_list_file){|line|
  line.chomp!
  line.lstrip!
  next if line.empty? || line =~ /^\#/ #
  mode, key, value = line.split(/\s+/, 3)
  value ||= ""
  if current_configs[mode] && current_configs[mode].has_key?(key)
    current_configs[mode][key] = value
  end
}

update_flag = false
current_configs['with'].each_key{|key|
  if (value = with_config(key).to_s) != current_configs['with'][key]
    update_flag = true
    current_configs['with'][key] = value
  end
}
current_configs['enable'].each_key{|key|
  if (value = enable_config(key).to_s) != current_configs['enable'][key]
    update_flag = true
    current_configs['enable'][key] = value
  end
}

# update current_configs
if update_flag || !File.exist?(config_list_file)
  open(config_list_file, 'w'){|fobj|
    fobj.print("# values of current configure options (generated by extconf.rb)\n");
    ['with', 'enable'].each{|mode|
      current_configs[mode].each_key{|key|
        fobj.print("#{mode} #{key} #{current_configs[mode][key]}\n")
      }
    }
  }
end

if update_flag
  puts "Configure options for Ruby/Tk may be updated."
  puts "So, delete files which depend on old configs."
  File.delete(*Dir.glob("*.#{CONFIG['DLEXT']}", File::FNM_CASEFOLD))
  File.delete(*Dir.glob("*.#{$OBJEXT}", File::FNM_CASEFOLD))
  File.delete('Makefile') rescue nil

else
  makefile = 'Makefile'
  if File.exist?(makefile) && 
      File.ctime(config_list_file) > File.ctime(makefile)
    # no need to update Makefile
    exit
  end
end


##############################################################
# fuctions
##############################################################
def is_win32?
  /mswin|mingw|cygwin|bccwin/ =~ RUBY_PLATFORM
end

def is_macosx?
 /darwin/ =~ RUBY_PLATFORM
end

def check_tcltk_version(version)
  return [nil, nil] unless version.kind_of? String

  version = version.strip

  tclver = version.dup
  tkver  = version.dup

  dot = major = minor_dot = minor = plvl_dot = plvl = ext = nil

  if version =~ /^(\d)(\.?)(\d)(\.?)(\d*)(.*)$/
    major = $1; minor_dot = $2; minor = $3; plvl_dot = $4; plvl = $5; ext = $6
    dot = ! minor_dot.empty?
    if plvl_dot.empty? && ! plvl.empty?
      minor << plvl
    end
  elsif version =~ /^(\d)(\.?)(\d?)(.*)$/
    major = $1; minor_dot = $2; minor = $3; ext = $4
    dot = ! minor_dot.empty?
  else # unknown -> believe user
    return [tclver, tkver]
  end

  # check Tcl7.6 / Tk4.2 ?
  if major == "7" # Tcl7.6 ( not support Tclversion < 7.6 )
    # Tk4.2
    tkver  = "4" + ((dot)? ".": "") + ((minor.empty)? "": "2") + ext
  elsif major == "4" # Tk4.2 ( not support Tkversion < 4.2 )
    # Tcl7.6
    tclver = "7" + ((dot)? ".": "") + ((minor.empty)? "": "6") + ext
  end

  [tclver, tkver]
end

def get_shlib_versions(major = 8, minor_max = 9, minor_min = 0, ext = "")
  if tclcfg = TkLib_Config["tclConfig_info"]
    major = tclcfg['TCL_MAJOR_VERSION'].to_i
    minor_min = tclcfg['TCL_MINOR_VERSION'].to_i

  elsif TkLib_Config["tcltkversion"]
    tclver, tkver = TkLib_Config["tcltkversion"]
    if tclver =~ /8\.?(\d)(.*)/
      minor_min = $1.to_i
      ext = $2
    else
      # unsupported version
      return [""]
    end
  end

  # if disable-stubs, version is fixed.
  minor_max = minor_min unless TkLib_Config["tcltk-stubs"]

  vers = []
  minor_max.downto(minor_min){|minor|
    vers << "#{major}.#{minor}#{ext}" unless ext.empty?
    vers << "#{major}.#{minor}"
  }

  vers << ""
end

def get_shlib_path_head
  path_head = []
  path_dirs = []

  if TkLib_Config["ActiveTcl"].kind_of?(String)  # glob path
    # path_head << TkLib_Config["ActiveTcl"]
    path_head.concat Dir.glob(TkLib_Config["ActiveTcl"], File::FNM_CASEFOLD).sort.reverse
    # path_dirs.concat Dir.glob(File.join(TkLib_Config["ActiveTcl"], 'lib'), File::FNM_CASEFOLD).sort.reverse
  end

  if CROSS_COMPILING
  elsif is_win32?
    if TkLib_Config["ActiveTcl"]
      path_head.concat ["c:/ActiveTcl", "c:/Program Files/ActiveTcl"]
    end
    path_head.concat [
      "c:/Tcl", "c:/Program Files/Tcl",
      "/Tcl", "/Program Files/Tcl"
    ]
    path_head.each{|dir| path_dirs << "#{dir}"}

  else
    [
      '/opt', '/pkg', '/share', 
      '/usr/local/opt', '/usr/local/pkg', '/usr/local/share', '/usr/local',
      '/usr/opt', '/usr/pkg', '/usr/share', '/usr/contrib', '/usr'
    ].each{|dir|
      next unless File.directory?(dir)

      path_dirs << "#{dir}/lib"
      path_dirs << "#{dir}" unless Dir.glob("#{dir}/lib*.*", File::FNM_CASEFOLD).empty?

      dirnames = []
      if TkLib_Config["ActiveTcl"]
        dirnames.concat ["ActiveTcl"]
      end
      dirnames.concat ["TclTk","Tcl_Tk","Tcl-Tk"]

      dirnames.each{|name|
        path_dirs << "#{dir}/#{name}" if File.directory?("#{dir}/#{name}")
        path_head << "#{dir}/#{name}" unless Dir.glob("#{dir}/#{name}[-89_]*", File::FNM_CASEFOLD).empty?
      }
    }
  end

  unless TkLib_Config["space-on-tk-libpath"]
    path_head.delete_if{|path| path =~ / /}
    path_dirs.delete_if{|path| path =~ / /}
  end

  [path_head, path_dirs]
end

def find_macosx_framework
  use_framework = is_macosx? && TkLib_Config["ActiveTcl"]

  use_framework ||= (tcl_hdr = with_config("tcl-framework-header"))
  use_framework ||= (tk_hdr  = with_config("tk-framework-header"))
  tcl_hdr = nil unless tcl_hdr.kind_of? String
  tk_hdr  = nil unless tk_hdr.kind_of? String
  TkLib_Config["tcl-framework-header"] = tcl_hdr
  TkLib_Config["tk-framework-header"]  = tk_hdr

  use_framework ||= (tcl_dir = with_config("tcl-framework-dir"))
  tcl_dir = nil unless tcl_dir.kind_of? String
  if !tcl_dir && tcl_hdr
    # e.g. /Library/Frameworks/Tcl.framework/Headers
    #       ==> /Library/Frameworks/Tcl.framework
    tcl_dir = File.dirname(tcl_hdr.strip.chomp('/'))
  end
  TkLib_Config["tcl-framework-dir"] = tcl_dir

  use_framework ||= (tk_dir = with_config("tk-framework-dir"))
  tk_dir = nil unless tk_dir.kind_of? String
  if !tk_dir && tk_hdr
    # e.g. /Library/Frameworks/Tk.framework/Headers
    #       ==> /Library/Frameworks/Tk.framework
    tk_dir = File.dirname(tk_hdr.strip.chomp('/'))
  end
  TkLib_Config["tk-framework-dir"] = tk_dir

  if tcl_dir && !tk_dir
    tk_dir = File.join(File.dirname(tcl_dir), 'Tk.framework')
    TkLib_Config["tk-framework-dir"] = tk_dir
  elsif !tcl_dir && tk_dir
    tcl_dir = File.join(File.dirname(tk_dir), 'Tcl.framework')
    TkLib_Config["tcl-framework-dir"] = tcl_dir
  end
  if tcl_dir && tk_dir
    TkLib_Config["tcltk-framework"] = File.dirname(tcl_dir) unless TkLib_Config["tcltk-framework"]
    return [tcl_dir, tk_dir]
  end

  # framework is disabled?
  if with_config("tcltk-framework") == false || 
      enable_config("tcltk-framework") == false
   return false
  end

  use_framework ||= (framework_dir = with_config("tcltk-framework"))
  if framework_dir.kind_of? String
    TkLib_Config["tcltk-framework"] = framework_dir.strip.chomp('/')
    return [File.join(TkLib_Config["tcltk-framework"], 'Tcl.framework'), 
            File.join(TkLib_Config["tcltk-framework"], 'Tk.framework')]
  end

  unless enable_config("tcltk-framework", use_framework) ||
      enable_config("mac-tcltk-framework", use_framework)
    TkLib_Config["tcltk-framework"] = false
    return false
  end

  paths = [
    #"~/Library/Frameworks", 
    "/Library/Frameworks",
    "/Network/Library/Frameworks", "/System/Library/Frameworks"
  ]
  paths.reverse! unless TkLib_Config["ActiveTcl"] # system has higher priority

  paths.map{|dir| dir.strip.chomp('/')}.each{|dir|
    next unless File.directory?(tcldir = File.join(dir, "Tcl.framework"))
    next unless File.directory?(tkdir  = File.join(dir, "Tk.framework"))
    TkLib_Config["tcltk-framework"] = dir
    return [tcldir, tkdir]
  }

  nil
end

def collect_tcltk_defs(tcl_defs_str, tk_defs_str)
  conflicts = [
    'PACKAGE_NAME', 'PACKAGE_TARNAME', 'PACKAGE_VERSION', 
    'PACKAGE_STRING', 'PACKAGE_BUGREPORT'
  ]

  begin
    # Ruby 1.9.x or later
    arch_config_h = RbConfig.expand($arch_hdrdir + "/ruby/config.h")
    if File.exist?(arch_config_h)
      keys = []
      IO.foreach(arch_config_h){|line|
        if line =~ /^#define +([^ ]+)/
            keys << $1
        end
      }
      conflicts = keys
    end
  rescue
    # ignore, use default
  end

  if tcl_defs_str
    tcl_defs = tcl_defs_str.split(/ ?-D/).map{|s|
      s =~ /^([^=]+)(.*)$/
      [$1, $2]
    }
  else
    tcl_defs = []
  end

  if tk_defs_str
    tk_defs = tk_defs_str.split(/ ?-D/).map{|s|
      s =~ /^([^=]+)(.*)$/
      [$1, $2]
    }
  else
    tk_defs = []
  end

  defs = tcl_defs | tk_defs

  defs.delete_if{|name,value|
    conflicts.include?(name) ||
      ( (vtcl = tcl_defs.assoc(name)) && (vtk = tk_defs.assoc(name)) && 
          vtcl != vtk )
  }

  defs.map{|ary| s = ary.join(''); (s.strip.empty?)? "": "-D" << s}.join(' ')
end

def parse_tclConfig(file)
  # check tclConfig.sh/tkConfig.sh
  tbl = Hash.new{|h,k| h[k] = ""}
  return tbl unless file
  IO.foreach(file){|line|
    line.strip!
    next if line !~ /^([^\#=][^=]*)=(['"]|)(.*)\2$/
    key, val = $1, $3
    tbl[key] = val.gsub(/\$\{([^}]+)\}/){|s|
      subst = $1
      (tbl[subst])? tbl[subst]: s
    } rescue nil
  }
  tbl
end

def get_libpath(lib_flag, lib_spec)
  # get libpath fro {TCL,Tk}_LIB_FLAG and {TCL,Tk}_LIB_SPEC
  libpath = lib_spec.gsub(/(#{lib_flag}|-L)/, "").strip
end

def get_tclConfig_dirs
  config_dir = []

  if CROSS_COMPILING
  elsif is_win32?
    if TkLib_Config["ActiveTcl"]
      dirs = []
      if TkLib_Config["ActiveTcl"].kind_of?(String)
        dirs << File.join(TkLib_Config["ActiveTcl"], 'lib')
      end
      dirs.concat [
        "c:/ActiveTcl*/lib", "c:/Tcl*/lib",
        "c:/Program Files/ActiveTcl*/lib", "c:/Program Files/Tcl*/lib",
        "/ActiveTcl*/lib", "/Tcl*/lib",
        "/Program Files/ActiveTcl*/lib", "/Program Files/Tcl*/lib"
      ]
    else
      dirs = [
        "c:/Tcl*/lib", "c:/Program Files/Tcl*/lib",
        "/Tcl*/lib", "/Program Files/Tcl*/lib"
      ]
    end
    dirs.collect{|d| Dir.glob(d, File::FNM_CASEFOLD)}.flatten!
    dirs |= dirs

    exeext = RbConfig::CONFIG['EXEEXT']
    ENV['PATH'].split(File::PATH_SEPARATOR).each{|dir|
      dir.tr!(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR
      next if Dir.glob(File.join(dir, "{tclsh,wish}*#{exeext}"), File::FNM_CASEFOLD).empty?
      dirs << File.expand_path(File.join(dir, '..', 'lib'))
      dirs << dir
      # dirs << File.expand_path(File.join(dir, '..'))
    }

    unless TkLib_Config["space-on-tk-libpath"]
      dirs.delete_if{|path| path =~ / /}
    end

    config_dir.concat(dirs.zip(dirs))

  else
    if framework = find_macosx_framework()
      config_dir.unshift(framework)
    end

    if activeTcl = TkLib_Config['ActiveTcl']
      # check latest version at first
      if is_macosx?
        base = File.expand_path(activeTcl)
        config_dir << [
          File.join(base, 'Tcl.framework'), File.join(base, 'Tk.framework')
        ]

        config_dir << [
          File.join(base, 'Tcl.framework', 'Versions', 'Current'),
          File.join(base, 'Tk.framework', 'Versions', 'Current')
        ]

        Dir.glob(File.join(base, 'Tcl.framework', 
                           'Versions', '*')).sort.reverse.each{|dir|
          next if dir =~ /Current/
          config_dir << [dir, dir.gsub(/Tcl/, 'Tk')]
        }
      else
        config_dir.concat(Dir.glob(File.join(activeTcl, 'lib'), File::FNM_CASEFOLD).sort.reverse)
      end
    end

    config_dir.concat [
      RbConfig::CONFIG['libdir'],
      File.join(RbConfig::CONFIG['exec_prefix'], 'lib'),
      File.join(RbConfig::CONFIG['prefix'], 'lib'), 
      "/usr/local/opt/lib", "/usr/local/pkg/lib", "/usr/local/share/lib", 
      "/usr/local/lib", "/usr/opt/lib", "/usr/pkg/lib", 
      "/usr/share/lib", "/usr/contrib/lib", "/usr/lib"
    ]

    config_dir.concat [
      '/opt', '/pkg', '/share', 
      '/usr/local/opt', '/usr/local/pkg', '/usr/local/share', '/usr/local',
      '/usr/opt', '/usr/pkg', '/usr/share', '/usr/contrib', '/usr'
    ].map{|dir|
      Dir.glob(dir + '/{tcltk,tcl,tk}[87]*/lib', File::FNM_CASEFOLD)
      Dir.glob(dir + '/{tcltk,tcl,tk}[87]*', File::FNM_CASEFOLD)
      Dir.glob(dir + '/{tcltk,tcl,tk}/lib', File::FNM_CASEFOLD)
      Dir.glob(dir + '/{tcltk,tcl,tk}', File::FNM_CASEFOLD)
    }.flatten!

    exeext = RbConfig::CONFIG['EXEEXT']
    ENV['PATH'].split(File::PATH_SEPARATOR).each{|dir|
      dir.tr!(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR
      next if Dir.glob(File.join(dir, "{tclsh,wish}*#{exeext}"), File::FNM_CASEFOLD).empty?
      config_dir << File.expand_path(File.join(dir, '..', 'lib'))
    }

    # for MacOS X
    paths = [
      #"~/Library/Tcl",
      "/Library/Tcl", "/Network/Library/Tcl", "/System/Library/Tcl"
    ]
    paths.reverse! unless TkLib_Config["ActiveTcl"]

    paths.each{|path|
      config_dir << path
      config_dir.concat(Dir.glob(File.join(path, '{tcl,tk}*'), File::FNM_CASEFOLD).sort.reverse.find_all{|d| File.directory?(d)})
    }

    paths = [
      #"~/Library/Frameworks", 
      "/Library/Frameworks",
      "/Network/Library/Frameworks", "/System/Library/Frameworks"
    ]
    paths.reverse! unless TkLib_Config["ActiveTcl"]

    paths.each{|framework|
      base = File.expand_path(framework)
      config_dir << [
        File.join(base, 'Tcl.framework'), File.join(base, 'Tk.framework')
      ]

      config_dir << [
        File.join(base, 'Tcl.framework', 'Versions', 'Current'),
        File.join(base, 'Tk.framework', 'Versions', 'Current')
      ]

      Dir.glob(File.join(base, 'Tcl.framework', 
                         'Versions', '*')).sort.reverse.each{|dir|
        next if dir =~ /Current/
        config_dir << [dir, dir.gsub(/Tcl/, 'Tk')]
      }
    }
  end

  config_dir
end

def libcheck_for_tclConfig(dir, tclconf, tkconf)
  tcllib_ok = tklib_ok = false

  if TkLib_Config["tcltk-stubs"]
    stub = "stub"
    tclfunc = "Tcl_InitStubs"
    tkfunc  = "Tk_InitStubs"
  else
    stub = ""
    tclfunc = "Tcl_FindExecutable"
    tkfunc  = "Tk_Init"
  end

  libpath = $LIBPATH
  tcllibs = nil

  begin
    tcllib_ok ||= Dir.glob(File.join(dir, "*tcl#{stub}#{tclconf['TCL_MAJOR_VERSION']}{.,}#{tclconf['TCL_MINOR_VERSION']}*.*"), File::FNM_CASEFOLD).find{|file|
      if file =~ /^.*(tcl#{stub}#{tclconf['TCL_MAJOR_VERSION']}(\.|)#{tclconf['TCL_MINOR_VERSION']}.*)\.[^.]*$/
        #puts "check #{file} #{$1} #{tclfunc} #{dir}"
        #find_library($1, tclfunc, dir)
        tcllibs = append_library($libs, $1)
        $LIBPATH = libpath | [dir]
        try_func(tclfunc, tcllibs)
      end
    }
    tklib_ok ||= Dir.glob(File.join(dir, "*tk#{stub}#{tkconf['TK_MAJOR_VERSION']}{.,}#{tkconf['TK_MINOR_VERSION']}*.*"), File::FNM_CASEFOLD).find{|file|
      if file =~ /^.*(tk#{stub}#{tkconf['TK_MAJOR_VERSION']}(\.|)#{tkconf['TK_MINOR_VERSION']}.*)\.[^.]*$/
        #puts "check #{file} #{$1} #{tkfunc} #{dir}"
        # find_library($1, tkfunc, dir)
        tklibs = append_library(tcllibs, $1)
        $LIBPATH = libpath | [dir]
        try_func(tkfunc, tklibs)
      end
    }
  ensure
    $LIBPATH = libpath
  end

  [tcllib_ok, tklib_ok]
end

def search_tclConfig(*paths) # libdir list or [tcl-libdir|file, tk-libdir|file]
  TkLib_Config["tclConfig_paths"] = []

  paths.compact!
  if paths.empty?
    config_dir = get_tclConfig_dirs
  else
    # fixed tclConfig
    config_dir = []
    paths.each{|path|
      if path.kind_of?(Array)
        config_dir << path
      else
        dirs = Dir.glob(path, File::FNM_CASEFOLD)
        config_dir.concat(dirs.zip(dirs))
      end
    }
  end

  tclver, tkver = TkLib_Config['tcltkversion']
  conf = nil

  config_dir.uniq!
  config_dir.map{|dir|
    if dir.kind_of? Array
      [dir[0].strip.chomp('/'), dir[1].strip.chomp('/')]
    else
      dir.strip.chomp('/')
    end
  }.each{|dir|
    print(".") # progress
    # print("check #{dir} ==>");
    if dir.kind_of? Array
      tcldir, tkdir = dir
    else
      tcldir = tkdir = dir
    end

    tails = ['Config-shared.sh', 'config-shared.sh', 'Config.sh', 'config.sh']

    if File.file?(tcldir)
      tclcfg_files = [tcldir] * tails.length
    else
      tclcfg_files = tails.map{|f| File.join(tcldir, 'tcl' << f)}
    end

    if File.file?(tkdir)
      tkcfg_files = [tkdir] * tails.length
    else
      tkcfg_files = tails.map{|f| File.join(tkdir, 'tk' << f)}
    end

    tclcfg_files.zip(tkcfg_files).uniq.each{|tclpath, tkpath|
      next if !File.exist?(tclpath) || !File.exist?(tkpath)

      # parse tclConfig.sh/tkConfig.sh
      tclconf = parse_tclConfig(tclpath)
      next if tclver && tclver !~ /^#{tclconf['TCL_MAJOR_VERSION']}(\.?)#{tclconf['TCL_MINOR_VERSION']}/
      tkconf = parse_tclConfig(tkpath)
      next if tkver && tkver !~ /^#{tkconf['TK_MAJOR_VERSION']}(\.?)#{tkconf['TK_MINOR_VERSION']}/

      # nativethread check
      if !TkLib_Config["ruby_with_thread"] && tclconf['TCL_THREADS'] == '1'
        puts "\nWARNING: found #{tclpath.inspect}, but it WITH nativethread-support under ruby WITHOUT nativethread-support. So, ignore it."
        TkLib_Config["tcltk-NG-path"] << File.dirname(tclpath)
        next
      end

      # find tclConfig.sh & tkConfig.sh
      conf = [tclconf, tkconf] unless conf

      # check Tcl library
      if is_macosx? && TkLib_Config["tcltk-framework"]
        # if use framework, not check (believe it is installed properly)
        tcllib_ok = tklib_ok = true
      else
        tcllib_ok, tklib_ok = libcheck_for_tclConfig(File.dirname(tclpath),
                                                      tclconf, tkconf)
=begin
        tcllib_ok = tklib_ok = false
        if TkLib_Config["tcltk-stubs"]
          stub = "stub"
          tclfunc = "Tcl_InitStubs"
          tkfunc  = "Tk_InitStubs"
        else
          stub = ""
          tclfunc = "Tcl_FindExecutable"
          tkfunc  = "Tk_Init"
        end
        dir = File.dirname(tclpath)
        libpath = $LIBPATH
        tcllibs = nil

        begin
          tcllib_ok ||= Dir.glob(File.join(dir, "*tcl#{stub}#{tclconf['TCL_MAJOR_VERSION']}{.,}#{tclconf['TCL_MINOR_VERSION']}*.*"), File::FNM_CASEFOLD).find{|file|
            if file =~ /^.*(tcl#{stub}#{tclconf['TCL_MAJOR_VERSION']}(\.|)#{tclconf['TCL_MINOR_VERSION']}.*)\.[^.]*$/
              #puts "check #{file} #{$1} #{tclfunc} #{dir}"
              #find_library($1, tclfunc, dir)
              tcllibs = append_library($libs, $1)
              $LIBPATH = libpath | [dir]
              try_func(tclfunc, tcllibs)
            end
          }
          tklib_ok ||= Dir.glob(File.join(dir, "*tk#{stub}#{tkconf['TK_MAJOR_VERSION']}{.,}#{tkconf['TK_MINOR_VERSION']}*.*"), File::FNM_CASEFOLD).find{|file|
            if file =~ /^.*(tk#{stub}#{tkconf['TK_MAJOR_VERSION']}(\.|)#{tkconf['TK_MINOR_VERSION']}.*)\.[^.]*$/
              #puts "check #{file} #{$1} #{tkfunc} #{dir}"
              # find_library($1, tkfunc, dir)
              tklibs = append_library(tcllibs, $1)
              $LIBPATH = libpath | [dir]
              try_func(tkfunc, tklibs)
            end
          }
        ensure
          $LIBPATH = libpath
        end
=end
      end

      unless tcllib_ok && tklib_ok
        puts "\nWARNING: found #{tclpath.inspect}, but cannot find valid Tcl/Tk libraries on the same directory. So, ignore it."
        TkLib_Config["tcltk-NG-path"] << File.dirname(tclpath)
        next
      end

      #return [tclpath, tkpath]
      # print(" #{[tclpath, tkpath].inspect}");
      TkLib_Config["tclConfig_paths"] << [tclpath, tkpath]
    }

    # print("\n");
  }

  if is_macosx? && TkLib_Config["tcltk-stubs"]
    CONFIG['LDSHARED'] << " -Xlinker -bind_at_load"
    if config_string('LDSHAREDXX')
      config_string('LDSHAREDXX') << " -Xlinker -bind_at_load"
    end
  end

  if TkLib_Config["tclConfig_paths"].empty?
    [nil, nil]
  else
    # find tclConfig.sh and tkConfig.sh
    TkLib_Config["tclConfig_info"], TkLib_Config["tkConfig_info"] = conf
    TkLib_Config["tclConfig_paths"][0]
  end
end

def get_tclConfig(tclConfig_file, tkConfig_file, tclConfig_dir, tkConfig_dir)
  use_tclConfig = (tclConfig_file != false) && (tkConfig_file != false) && 
    (tclConfig_dir != false) && (tkConfig_dir != false)

  unless use_tclConfig
    puts("Don't use [tclConfig.sh, tkConfig.sh]")
    return [nil, nil]
  end

  tclConfig_file = nil unless tclConfig_file.kind_of? String
  tkConfig_file = nil unless tkConfig_file.kind_of? String
  tclConfig_dir = nil unless tclConfig_dir.kind_of? String
  tkConfig_dir = nil unless tkConfig_dir.kind_of? String

  unless tclConfig_dir
    if tclConfig_file
      tclConfig_dir = File.dirname(tclConfig_file)
    elsif tkConfig_dir
      tclConfig_dir = tkConfig_dir
    end
  end
  unless tkConfig_dir
    if tkConfig_file
      tkConfig_dir = File.dirname(tkConfig_file)
    elsif tclConfig_dir
      tkConfig_dir = tclConfig_dir
    end
  end
  tkConfig_dir ||= tclConfig_dir

  TkLib_Config["tclConfig-file"] = tclConfig_file
  TkLib_Config["tkConfig-file"] = tkConfig_file
  TkLib_Config["tclConfig-dir"] = tclConfig_dir
  TkLib_Config["tkConfig-dir"] = tkConfig_dir

  print("Search tclConfig.sh", (tclConfig_dir)? " (in #{tclConfig_dir})": "", 
        " and tkConfig.sh", (tkConfig_dir)? " (in #{tkConfig_dir})": "", ".")
  if tclConfig_dir
    tclConfig, tkConfig = 
      search_tclConfig([ ((tclConfig_file)? tclConfig_file: tclConfig_dir), 
                         ((tkConfig_file)?  tkConfig_file:  tkConfig_dir) ])
  else
    tclConfig, tkConfig = search_tclConfig()
  end
  print("\n")
  # TclConfig_Info = TkLib_Config["tclConfig_info"]
  # TkConfig_Info  = TkLib_Config["tkConfig_info"]

  if tclConfig && tkConfig
    dirs = TkLib_Config["tclConfig_paths"].map{|tclpath, tkpath|
      File.dirname(tclpath)
    }
    dirs |= dirs
    puts("Valid tclConfig.sh and tkConfig.sh are found in #{dirs.inspect}")
    puts("Use [tclConfig.sh,tkConfig.sh] == ['#{tclConfig}','#{tkConfig}']")
    $LIBPATH |= [File.dirname(tclConfig)]
    $LIBPATH |= [File.dirname(tkConfig)]
    #TkLib_Config["tclConfig_paths"].each{|tclcfg, tkcfg|
    #  $LIBPATH |= [File.dirname(tclcfg)] | [File.dirname(tkcfg)]
    #}
  else
    puts("Fail to find [tclConfig.sh, tkConfig.sh]")
  end

  [tclConfig, tkConfig]
end

def check_NG_path(path_list)
  path_list.find_all{|path| not TkLib_Config["tcltk-NG-path"].include?(path) }
end

def check_shlib_search_path(paths)
  if !paths || paths.empty?
    path_list = []

    #if TkLib_Config["ActiveTcl"]
    #  path_list.concat Dir.glob(TkLib_Config["ActiveTcl"], File::FNM_CASEFOLD).sort.reverse
    #end
    if TkLib_Config["ActiveTcl"].kind_of?(String)  # glob path
      path_list.concat Dir.glob(TkLib_Config["ActiveTcl"], File::FNM_CASEFOLD).sort.reverse
    end

    vers = get_shlib_versions
    path_head, path_dirs = get_shlib_path_head

    path_list.concat vers.map{|ver|
      path_head.map{|head|
        if ver.empty?
          head + "/lib"
        else
          dirs = []

          if Dir.glob(head, File::FNM_CASEFOLD).find{|dir| dir == head}
            dirs << head + "/lib"
          end

          if !Dir.glob(head + "-*", File::FNM_CASEFOLD).empty?
            dirs << head + "-#{ver}/lib" if !Dir.glob(head + "-[89].*", File::FNM_CASEFOLD).empty?
            dirs << head + "-#{ver.delete('.')}/lib" if !Dir.glob(head + "-[89][0-9]*", File::FNM_CASEFOLD).empty?
          end

          if !Dir.glob(head + "[_-]*", File::FNM_CASEFOLD).empty?
            dirs << head + "_#{ver}/lib" if !Dir.glob(head + "_[89].*", File::FNM_CASEFOLD).empty?
            dirs << head + "-#{ver}/lib" if !Dir.glob(head + "-[89].*", File::FNM_CASEFOLD).empty?
            dirs << head + "_#{ver.delete('.')}/lib" if !Dir.glob(head + "_[89][0-9]*", File::FNM_CASEFOLD).empty?
            dirs << head + "-#{ver.delete('.')}/lib" if !Dir.glob(head + "-[89][0-9]*", File::FNM_CASEFOLD).empty?
          end

          dirs
        end
      }
    }.flatten!

    path_list.concat path_dirs

  else
    # paths is a string with PATH environment style
    path_list = paths.split((is_win32?)? ';': ':')
  end

  path_list = check_NG_path(path_list)
  path_list.map!{|path| path.strip}

  if !CROSS_COMPILING and (is_win32? || is_macosx?)
    # exist-dir only
    path_list.delete_if{|path| Dir.glob(File.join(path, "*.{a,so,dll,lib}")).empty?}
  end

  # keep paths for searching dynamic libs
  $LIBPATH |= path_list
end

def search_vers_on_path(vers, path, *heads)
  if enable_config("shared") == false
    exts = CONFIG['LIBEXT'] + ',' + CONFIG['DLEXT']
  else
    exts = CONFIG['DLEXT'] + ',' + CONFIG['LIBEXT']
  end
  exts << ",dll,lib" if is_win32?
  exts << ",bundle,dylib" if is_macosx? || /nextstep|openstep|rhapsody/ =~ RUBY_PLATFORM
  files = Dir.glob(File.join(path, "*{#{heads.join(',')}}*.{#{exts}}"), File::FNM_CASEFOLD)
  vers.find_all{|ver| files.find{|f| f =~ /(#{ver}|#{ver.delete('.')})/} }
end

def find_tcl(tcllib, stubs, version, *opt_paths)
  print "Search Tcl library"

  if stubs
    func = "Tcl_InitStubs"
    lib = "tclstub"
  else
    func = "Tcl_FindExecutable"
    lib = "tcl"
  end

  if version && ! version.empty?
    versions = [version]
  else
    versions = TkLib_Config['search_versions']
  end

  default_paths = []

  default_paths.concat [
    RbConfig::CONFIG['libdir'],
    File.join(RbConfig::CONFIG['exec_prefix'], 'lib'),
    File.join(RbConfig::CONFIG['prefix'], 'lib'),
    "/usr/local/lib", "/usr/pkg/lib", "/usr/contrib/lib", "/usr/lib"
  ].find_all{|dir| File.directory?(dir)} unless CROSS_COMPILING

  if TkLib_Config["ActiveTcl"].kind_of?(String)  # glob path
    default_paths.concat Dir.glob(TkLib_Config["ActiveTcl"]).sort.reverse.map{|d| d << "/lib"}
  end

  if !CROSS_COMPILING and is_win32?
    default_paths.concat [
      "c:/Tcl/lib", "c:/Program Files/Tcl/lib",
      "/Tcl/lib", "/Program Files/Tcl/lib"
    ].find_all{|dir| File.directory?(dir)}
  end

  unless TkLib_Config["space-on-tk-libpath"]
    default_paths.delete_if{|path| path =~ / /}
  end

  if (paths = opt_paths.compact).empty?
    unless TclConfig_Info['config_file_path']
      paths = check_NG_path(default_paths)

    else
      # use definisions on tclConfig.sh
      TclConfig_Info['TCL_LIB_SPEC'].sub(TclConfig_Info['TCL_LIB_FLAG'],"").strip.sub("-L","") =~ /("|'|)([^"']+)\1/
      $LIBPATH |= [$2] unless $2.empty?

      if stubs
        if TclConfig_Info['TCL_SUPPORTS_STUBS'] == '0' ||
            TclConfig_Info['TCL_STUB_LIB_SPEC'].strip.empty?
          print(".\n") # progress
          puts "#{TclConfig_Info['config_file_path']} tells us that your Tcl/Tk library doesn't support stub."
          return false
        else
          #*** Probably, TCL_LIBS is a subset of TK_LIBS. ***
          unless is_win32? # ignore tclConfig on Windows
            # $LDFLAGS << ' ' << TclConfig_Info['TCL_LIBS']
            # $DLDFLAGS << ' ' << TclConfig_Info['TCL_LIBS']
            $LDFLAGS << ' ' << TclConfig_Info['TCL_STUB_LIB_SPEC']
          end
        end
      else
        #*** Probably, TCL_LIBS is a subset of TK_LIBS. ***
        unless is_win32? # ignore tclConfig on Windows
          # $LDFLAGS << ' ' << TclConfig_Info['TCL_LIBS']
          # $DLDFLAGS << ' ' << TclConfig_Info['TCL_LIBS']
          $LDFLAGS << ' ' << TclConfig_Info['TCL_LIB_SPEC']
        end
      end

      paths = [File.dirname(TclConfig_Info['config_file_path'])]
      versions = [TclConfig_Info['TCL_VERSION']]
    end
  end

  ret = paths.map{|path|
    if tcllib
      print(".")
      [path, find_library(tcllib, func, path)]
    else
      st = search_vers_on_path(versions, path, lib, 'tcl').find{|ver|
        (print(".");find_library("#{lib}#{ver}", func, path)) or
          (print(".");find_library("#{lib}#{ver.delete('.')}", func, path)) or
          (print(".");find_library("#{lib}#{ver}g", func, path)) or
          (print(".");find_library("#{lib}#{ver.delete('.')}g", func, path)) or
          (print(".");find_library("tcl#{ver}", func, path)) or
          (print(".");find_library("tcl#{ver.delete('.')}", func, path)) or
          (print(".");find_library("tcl#{ver}g", func, path)) or
          (print(".");find_library("tcl#{ver.delete('.')}g", func, path))
      } || (!version && (print(".");find_library(lib, func, path)))
      [path, st]
    end
  }

  print("\n") # progress
  ret
end

def parse_TK_LIBS(tklibs)
  sfx = "lib|shlib|dll|so"
  re = /(("|')[^"']+\.(#{sfx})\2|[^"' ]+\.(#{sfx})|-l("|')[^"']+\5|-l[^" ]+)/#'

  tklibs.scan(re).map{|lib,|
    if lib =~ /^("|')([^"]+)\.(#{sfx})\1/
        "\"-l#{$2}\""
    elsif lib =~ /([^" ]+)\.(#{sfx})/
        "-l#{$1}"
    else
      lib
    end
  }.join(' ')
end

def find_tk(tklib, stubs, version, *opt_paths)
  print "Search Tk library"

  if stubs
    func = "Tk_InitStubs"
    lib = "tkstub"
  else
    func = "Tk_Init"
    lib = "tk"
  end

  if version && ! version.empty?
    versions = [version]
  else
    versions = TkLib_Config['search_versions']
  end

  default_paths = []

  default_paths.concat [
    RbConfig::CONFIG['libdir'],
    File.join(RbConfig::CONFIG['exec_prefix'], 'lib'),
    File.join(RbConfig::CONFIG['prefix'], 'lib'),
    "/usr/local/lib", "/usr/pkg/lib", "/usr/contrib/lib", "/usr/lib"
  ].find_all{|dir| File.directory?(dir)} unless CROSS_COMPILING

  if !CROSS_COMPILING and is_win32?
    default_paths.concat [
      "c:/Tcl/lib", "c:/Program Files/Tcl/lib",
      "/Tcl/lib", "/Program Files/Tcl/lib"
    ].find_all{|dir| File.directory?(dir)}
  end

  unless TkLib_Config["space-on-tk-libpath"]
    default_paths.delete_if{|path| path =~ / /}
  end

  if (paths = opt_paths.compact).empty?
    unless TkConfig_Info['config_file_path']
      paths = check_NG_path(default_paths)

    else
      # use definisions on tkConfig.sh
      TkConfig_Info['TK_LIB_SPEC'].sub(TkConfig_Info['TK_LIB_FLAG'],"").strip.sub("-L","") =~ /("|'|)([^"']+)\1/
      $LIBPATH |= [$2] unless $2.empty?

      if stubs
        if TkConfig_Info['TK_STUB_LIB_SPEC'].strip.empty?
          print(".\n") # progress
          puts "#{TkConfig_Info['config_file_path']} tells us that your Tcl/Tk library doesn't support stub."
          return false
        else
          unless is_win32? # ignore tclConfig on Windows
            # $LDFLAGS << ' ' << parse_TK_LIBS(TkConfig_Info['TK_LIBS'])
            $LDFLAGS << ' ' << TkConfig_Info['TK_LIBS']
            # $DLDFLAGS << ' ' << parse_TK_LIBS(TkConfig_Info['TK_LIBS'])
            $LDFLAGS << ' ' << TkConfig_Info['TK_STUB_LIB_SPEC']
          end
        end
      else
        unless is_win32? # ignore tclConfig on Windows
          # $LDFLAGS << ' ' << parse_TK_LIBS(TkConfig_Info['TK_LIBS'])
          $LDFLAGS << ' ' << TkConfig_Info['TK_LIBS'] unless is_win32?
          # $DLDFLAGS << ' ' << parse_TK_LIBS(TkConfig_Info['TK_LIBS'])
          $LDFLAGS << ' ' << TkConfig_Info['TK_LIB_SPEC'] unless is_win32?
        end
      end

      paths = [File.dirname(TkConfig_Info['config_file_path'])]
      versions = [TkConfig_Info['TK_VERSION']]
    end
  end

  ret = paths.map{|path|
    if tklib
      print(".")
      [path, find_library(tklib, func, path)]
    else
      st = search_vers_on_path(versions, path, lib, 'tk').find{|ver|
        (print(".");find_library("#{lib}#{ver}", func, path)) or
          (print(".");find_library("#{lib}#{ver.delete('.')}", func, path)) or
          (print(".");find_library("#{lib}#{ver}g", func, path)) or
          (print(".");find_library("#{lib}#{ver.delete('.')}g", func, path)) or
          (print(".");find_library("tk#{ver}", func, path)) or
          (print(".");find_library("tk#{ver.delete('.')}", func, path)) or
          (print(".");find_library("tk#{ver}g", func, path)) or
          (print(".");find_library("tk#{ver.delete('.')}g", func, path))
      } || (!version && (print(".");find_library(lib, func, path)))
      [path, st]
    end
  }

  print("\n") # progress
  ret
end

def find_tcltk_library(tcllib, tklib, stubs, tclversion, tkversion, 
                       tcl_opt_paths, tk_opt_paths)
  ret = find_tcl(tcllib, stubs, tclversion, *tcl_opt_paths)
  unless ret && ret.find{|path, val| val}
    puts("Warning:: cannot find Tcl library. tcltklib will not be compiled (tcltklib is disabled on your Ruby == Ruby/Tk will not work). Please check configure options.")
    return false
  end

  ret = find_tk(tklib, stubs, tkversion, *tk_opt_paths)
  unless ret && ret.find{|path, val| val}
    puts("Warning:: cannot find Tk library. tcltklib will not be compiled (tcltklib is disabled on your Ruby == Ruby/Tk will not work). Please check configure options.")
    return false
  end

  true
end

def find_tcltk_header(tclver, tkver)
  base_dir = []

  base_dir.concat [
    File.join(RbConfig::CONFIG['prefix'], 'include'),
    "/usr/local/include", "/usr/pkg/include", "/usr/contrib/include",
    "/usr/include"
  ].find_all{|dir| File.directory?(dir)}

  if !CROSS_COMPILING && is_win32?
    base_dir.concat [
      "c:/Tcl/include", "c:/Program Files/Tcl/include",
      "/Tcl/include", "/Program Files/Tcl/include"
    ].find_all{|dir| File.directory?(dir)}
  end

  unless TkLib_Config["space-on-tk-libpath"]
    base_dir.delete_if{|path| path =~ / /}
  end

  if TclConfig_Info['TCL_INCLUDE_SPEC'] && 
      have_tcl_h = try_cpp('#include <tcl.h>', TclConfig_Info['TCL_INCLUDE_SPEC'])
    $INCFLAGS << " " << TclConfig_Info['TCL_INCLUDE_SPEC']
  elsif have_tcl_h = have_header('tcl.h')
    # find
  else
    if tclver && ! tclver.empty?
      versions = [tclver]
    else
      versions = TkLib_Config['search_versions']
    end
    paths = base_dir.dup
    versions.each{|ver| 
      paths.concat(base_dir.map{|dir|
                     [dir + '/tcl' + ver, dir + '/tcl' + ver.delete('.')]
                   }.flatten)
    }
    have_tcl_h = find_header('tcl.h', *paths)
  end

  if TkConfig_Info['TK_INCLUDE_SPEC'] && 
      have_tk_h = try_cpp('#include <tk.h>', TkConfig_Info['TK_INCLUDE_SPEC'])
    $INCFLAGS << " " << TkConfig_Info['TK_INCLUDE_SPEC']
  elsif have_tk_h = have_header('tk.h')
    # find
  else
    if tkver && ! tkver.empty?
      versions = [tkver]
    else
      versions = TkLib_Config['search_versions']
    end
    paths = base_dir.dup
    versions.each{|ver| 
      paths.concat(base_dir.map{|dir|
                     [dir + '/tk' + ver, dir + '/tk' + ver.delete('.')]
                   }.flatten)
    }
    have_tk_h = find_header('tk.h', *paths)
  end

  have_tcl_h && have_tk_h
end

def setup_for_macosx_framework(tclver, tkver)
  # use framework, but no tclConfig.sh
  unless $LDFLAGS.include?('-framework')
    $LDFLAGS << ' -framework Tk -framework Tcl'
  end

  if TkLib_Config["tcl-framework-header"]
    TclConfig_Info['TCL_INCLUDE_SPEC'] <<
      "-I#{TkLib_Config["tcl-framework-header"].quote} "
  else
    TclConfig_Info['TCL_INCLUDE_SPEC'] = ""

    tcl_base = File.join(TkLib_Config["tcltk-framework"], 'Tcl.framework')
    if tclver
      TclConfig_Info['TCL_INCLUDE_SPEC'] <<
        "-I#{File.join(tcl_base, 'Versions', tclver, 'Headers').quote} "
    end

    TclConfig_Info['TCL_INCLUDE_SPEC'] << File.join(tcl_base, 'Headers')

    unless tclver
      dir = Dir.glob(File.join(tcl_base, 'Versions', '*', 'Headers'), 
                     File::FNM_CASEFOLD).sort.reverse[0]
      TclConfig_Info['TCL_INCLUDE_SPEC'] << "-I#{dir.quote} " if dir
    end
  end

  if TkLib_Config["tk-framework-header"]
    TkConfig_Info['TK_INCLUDE_SPEC'] = 
      "-I#{TkLib_Config["tk-framework-header"].quote} "
  else
    TkConfig_Info['TK_INCLUDE_SPEC'] = ""

    tk_base  = File.join(TkLib_Config["tcltk-framework"], 'Tk.framework')
    if tkver
      TkConfig_Info['TK_INCLUDE_SPEC'] <<
        "-I#{File.join(tk_base, 'Versions', tkver, 'Headers').quote} "
    end

    TkConfig_Info['TK_INCLUDE_SPEC'] << File.join(tk_base, 'Headers')

    unless tkver
      dir = Dir.glob(File.join(tk_base, 'Versions', '*', 'Headers'), 
                     File::FNM_CASEFOLD).sort.reverse[0]
      TkConfig_Info['TK_INCLUDE_SPEC'] << "-I#{dir.quote} " if dir
    end
  end
end

def find_X11(*opt_paths)
  defaults =
    [ "/usr/X11*/lib", "/usr/lib/X11*", "/usr/local/X11*", "/usr/openwin/lib" ]
  paths = []
  opt_paths.compact.each{|path| paths.concat(Dir.glob(path.strip.chomp('/'), File::FNM_CASEFOLD))}
  defaults.compact.each{|path| paths.concat(Dir.glob(path.strip.chomp('/'), File::FNM_CASEFOLD))}
  st = find_library("X11", "XOpenDisplay", *paths)
  unless st
    puts("Warning:: cannot find X11 library. tcltklib will not be compiled (tcltklib is disabled on your Ruby == Ruby/Tk will not work). Please check configure options. If your Tcl/Tk don't require X11, please try --without-X11.")
  end
  st
end

def search_X_libraries
  if TkConfig_Info['config_file_path']
    # use definitions on tkConfig.sh
    if TkConfig_Info['TK_XINCLUDES'] && TkConfig_Info['TK_XLIBSW'] &&
        !TkConfig_Info['TK_XINCLUDES'].strip.empty? &&
        !TkConfig_Info['TK_XLIBSW'].strip.empty?
      #use_X = true && with_config("X11", ! is_win32?)
      use_X = with_config("X11", true)
    else
      #use_X = false || with_config("X11", false)
      use_X = with_config("X11", false)
    end
  else
    # depend on configure options
    use_X = with_config("X11", !(is_win32? || TkLib_Config["tcltk-framework"]))
  end

  if use_X
    puts("Use X11 libraries.")
    x11_idir, x11_ldir = dir_config("X11")
    x11_ldir2 = with_config("X11-lib")
    unless find_X11(x11_ldir2, x11_ldir)
      puts("Can't find X11 libraries. So, can't make tcltklib.so which is required by Ruby/Tk.")
      exit
    end

    if TkConfig_Info['TK_XINCLUDES'] &&
        !TkConfig_Info['TK_XINCLUDES'].strip.empty?
      $INCFLAGS << " " << TkConfig_Info['TK_XINCLUDES'].strip
    end
  end

  use_X
end

def pthread_check()
  tcl_major_ver = nil
  tcl_minor_ver = nil

  # Is tcl-thread given by user ?
  case enable_config("tcl-thread")
  when true
    tcl_enable_thread = true
  when false
    tcl_enable_thread = false
  else
    tcl_enable_thread = nil
  end

  if TclConfig_Info['config_file_path']
    if tcl_enable_thread == true
      puts("Warning: definiton of tclConfig.sh is ignored, because --enable-tcl-thread option is given.")
    elsif tcl_enable_thread == false
      puts("Warning: definition of tclConfig.sh is ignored, because --disable-tcl-thread option is given.")
    else
      # tcl-thread is unknown and tclConfig.sh is given
      if TclConfig_Info['TCL_THREADS']
        tcl_enable_thread = (TclConfig_Info['TCL_THREADS'] == "1")
      else
        tcl_major_ver = TclConfig_Info['TCL_MAJOR_VERSION'].to_i
        tcl_minor_ver = TclConfig_Info['TCL_MINOR_VERSION'].to_i
        if tcl_major_ver < 8 || (tcl_major_ver == 8 && tcl_minor_ver == 0)
          tcl_enable_thread = false
        end
      end

      if tcl_enable_thread == nil
        # cannot find definition
        if tcl_major_ver
          puts("Warning: '#{TclConfig_Info['config_file_path']}' doesn't include TCL_THREADS definition.")
        else
          puts("Warning: '#{TclConfig_Info['config_file_path']}' may not be a tclConfig file.")
        end
        tclConfig = false
      end
    end
  end

  if tcl_enable_thread == nil && !TclConfig_Info['config_file_path']
    # tcl-thread is unknown and tclConfig is unavailable
    begin
      try_run_available = try_run("int main() { exit(0); }")
    rescue Exception
      # cannot try_run. Is CROSS-COMPILE environment?
      puts(%Q'\
*****************************************************************************
**
** NATIVETHREAD SUPPORT CHECK WARNING:
**
**   We cannot check the consistency of nativethread support between 
**   Ruby and the Tcl/Tk library in your environment (are you perhaps
**   cross-compiling?). If nativethread support for these 2 packages 
**   is inconsistent you may find you get errors when running Ruby/Tk
**   (e.g. hangs or segmentation faults).  We strongly recommend
**   you to check the consistency manually.
**
*****************************************************************************
')
      return true
    end
  end

  if tcl_enable_thread == nil
    # tcl-thread is unknown
    if try_run(<<EOF)
#include <tcl.h>
int main() {
   Tcl_Interp *ip;
   ip = Tcl_CreateInterp();
   exit((Tcl_Eval(ip, "set tcl_platform(threaded)") == TCL_OK)? 0: 1);
}
EOF
      tcl_enable_thread = true
    elsif try_run(<<EOF)
#include <tcl.h>
static Tcl_ThreadDataKey dataKey;
int main() { exit((Tcl_GetThreadData(&dataKey, 1) == dataKey)? 1: 0); }
EOF
      tcl_enable_thread = true
    else
      tcl_enable_thread = false
    end
  end

  # check pthread mode
  if (TkLib_Config["ruby_with_thread"])
    # ruby -> enable
    unless tcl_enable_thread
      # ruby -> enable && tcl -> disable
      puts(%Q'\
*****************************************************************************
**
** NATIVETHREAD SUPPORT MODE WARNING:
**
**   Ruby is compiled with --enable-pthread, but your Tcl/Tk library 
**   seems to be compiled without nativethread support. Although you can 
**   create the tcltklib library, this combination may cause errors (e.g. 
**   hangs or segmentation faults). If you have no reason to keep the 
**   current nativethread support status, we recommend you reconfigure and 
**   recompile the libraries so that both or neither support nativethreads.
**
**   If you want change the status of nativethread support, please recompile
**   Ruby without "--enable-pthread" configure option (If you use Ruby 1.9.x
**   or later, you cannot remove this option, because it requires native-
**   thread support.) or recompile Tcl/Tk with "--enable-threads" configure 
**   option (if your Tcl/Tk is later than or equal to Tcl/Tk 8.1).
**
*****************************************************************************
')
    end

    # ruby -> enable && tcl -> enable/disable
    if tcl_enable_thread
      $CPPFLAGS += ' -DWITH_TCL_ENABLE_THREAD=1'
    else
      $CPPFLAGS += ' -DWITH_TCL_ENABLE_THREAD=0'
    end

    return true

  else
    # ruby -> disable
    if tcl_enable_thread
      # ruby -> disable && tcl -> enable
      puts(%Q'\
*****************************************************************************
**
** NATIVETHREAD SUPPORT MODE ERROR:
**
**   Ruby is not compiled with --enable-pthread, but your Tcl/Tk
**   library seems to be compiled with nativethread support. This
**   combination may cause frequent hang or segmentation fault
**   errors when Ruby/Tk is working. We recommend that you NEVER
**   create the library with such a combination of nativethread support.
**
**   Please recompile Ruby with the "--enable-pthread" configure option
**   or recompile Tcl/Tk with the "--disable-threads" configure option.
**
*****************************************************************************
')
      $CPPFLAGS += ' -DWITH_TCL_ENABLE_THREAD=1'
      return false
    else
      # ruby -> disable && tcl -> disable
      $CPPFLAGS += ' -DWITH_TCL_ENABLE_THREAD=0'
      return true
    end
  end
end

##############################################################
# main
##############################################################
# check header file
print("check functions.")
have_func("ruby_native_thread_p", "ruby.h")
print(".") # progress
have_func("rb_errinfo", "ruby.h")
print(".") # progress
have_func("rb_safe_level", "ruby.h")
print(".") # progress
have_func("rb_hash_lookup", "ruby.h")
print(".") # progress
have_func("rb_proc_new", "ruby.h")
print(".") # progress
have_func("rb_obj_untrust", "ruby.h")
print(".") # progress
have_func("rb_obj_taint", "ruby.h")
print(".") # progress
have_func("rb_set_safe_level_force", "ruby.h")
print(".") # progress
have_func("rb_sourcefile", "ruby.h")
print("\n") # progress

print("check struct members.")
have_struct_member("struct RArray", "ptr", "ruby.h")
print(".") # progress
have_struct_member("struct RArray", "len", "ruby.h")
print("\n") # progress

# check libraries
unless is_win32?
  print("check libraries.")
  have_library("nsl", "t_open")
  print(".") # progress
  have_library("socket", "socket")
  print(".") # progress
  have_library("dl", "dlopen")
  print(".") # progress
  have_library("m", "log", "math.h")
  print("\n") # progress
end
$CPPFLAGS += ' -D_WIN32' if /cygwin/ =~ RUBY_PLATFORM

# Does ruby have nativethread ?
TkLib_Config["ruby_with_thread"] = 
  macro_defined?('HAVE_NATIVETHREAD', '#include "ruby.h"')


#---------------------------------------------------
# check requirement of Tcl/tk version
tcltk_version = with_config("tcltkversion")
tclver, tkver = 
  TkLib_Config["tcltkversion"] = check_tcltk_version(tcltk_version)
puts("Specified Tcl/Tk version is #{[tclver, tkver].inspect}") if tclver&&tkver

# use ActiveTcl ?
#if activeTcl = with_config("ActiveTcl")
if activeTcl = with_config("ActiveTcl", true)
  puts("Use ActiveTcl libraries (if available).")
  unless activeTcl.kind_of? String
    # set default ActiveTcl path
    if CROSS_COMPILING
    elsif is_win32?
      activeTcl = 'c:/Tcl*'
    elsif is_macosx?
      activeTcl = '/Library/Frameworks'
    else
      activeTcl = '/opt/ActiveTcl*'
    end
  end
end
TkLib_Config["ActiveTcl"] = activeTcl

# allow space chars on a libpath
TkLib_Config["space-on-tk-libpath"] = 
  enable_config("space-on-tk-libpath", ! is_win32?)

# enable Tcl/Tk stubs?
=begin
if TclConfig_Info['TCL_STUB_LIB_SPEC'] && TkConfig_Info['TK_STUB_LIB_SPEC'] && 
    !TclConfig_Info['TCL_STUB_LIB_SPEC'].strip.empty? &&
    !TkConfig_Info['TK_STUB_LIB_SPEC'].strip.empty?
  stubs = true
  unless (st = enable_config("tcltk-stubs")).nil?
    stubs &&= st
  end
  unless (st = with_config("tcltk-stubs")).nil?
    stubs &&= st
  end
else
  stubs = enable_config("tcltk-stubs") || with_config("tcltk-stubs")
end
=end
stubs = enable_config("tcltk-stubs") || with_config("tcltk-stubs")
if (TkLib_Config["tcltk-stubs"] = stubs)
  puts("Compile with Tcl/Tk stubs.")
  $CPPFLAGS += ' -DUSE_TCL_STUBS -DUSE_TK_STUBS'
end

# directory configuration of Tcl/Tk libraries
tk_idir,  tk_ldir  = dir_config("tk")
tcl_idir, tcl_ldir = dir_config("tcl")

tcl_idir = tk_idir unless tcl_idir
tcl_ldir = tk_ldir unless tcl_ldir
tk_idir = tcl_idir unless tk_idir
tk_ldir = tcl_ldir unless tk_ldir

# get tclConfig.sh/tkConfig.sh
TkLib_Config["tcltk-NG-path"] = []
tclcfg, tkcfg = get_tclConfig(with_config("tclConfig-file", true),
                              with_config("tkConfig-file", true),
                              with_config("tclConfig-dir", tcl_ldir || true),
                              with_config("tkConfig-dir", tk_ldir || true))
TclConfig_Info = TkLib_Config["tclConfig_info"] || {}
TkConfig_Info  = TkLib_Config["tkConfig_info"] || {}
TclConfig_Info['config_file_path'] = tclcfg
TkConfig_Info['config_file_path'] = tkcfg

TclConfig_Info['TCL_INCLUDE_SPEC'] = "-I#{tcl_idir.quote}" if tcl_idir
TkConfig_Info['TK_INCLUDE_SPEC']   = "-I#{tk_idir.quote}"  if tk_idir

tk_cfg_dir  = File.dirname(TkConfig_Info['config_file_path'])  rescue nil
tcl_cfg_dir = File.dirname(TclConfig_Info['config_file_path']) rescue nil

tk_ldir_list  = [tk_ldir,  tk_cfg_dir]
tcl_ldir_list = [tcl_ldir, tcl_cfg_dir]

# check tk_shlib_search_path
check_shlib_search_path(with_config('tk-shlib-search-path'))

# set TCL_DEFS and TK_DEFS
# $CPPFLAGS += " #{TclConfig_Info['TCL_DEFS']}"
# $CPPFLAGS += " #{TkConfig_Info['TK_DEFS']}"
$CPPFLAGS += collect_tcltk_defs(TclConfig_Info['TCL_DEFS'], TkConfig_Info['TK_DEFS'])

# MacOS X Frameworks?
if TkLib_Config["tcltk-framework"]
  puts("Use MacOS X Frameworks.")
  if tcl_cfg_dir
    $INCFLAGS << ' ' << TclConfig_Info['TCL_INCLUDE_SPEC']
    $LDFLAGS  << ' ' << TclConfig_Info['TCL_LIBS']
    if stubs
      $LDFLAGS << ' ' << TclConfig_Info['TCL_STUB_LIB_SPEC']
    else
      $LDFLAGS << ' ' << TclConfig_Info['TCL_LIB_SPEC']
    end
  end
  if tk_cfg_dir
    $INCFLAGS << ' ' << TkConfig_Info['TK_INCLUDE_SPEC']
    $LDFLAGS  << ' ' << TkConfig_Info['TK_LIBS']
    if stubs
      $LDFLAGS << ' ' << TkConfig_Info['TK_STUB_LIB_SPEC']
    else
      $LDFLAGS << ' ' << TkConfig_Info['TK_LIB_SPEC']
    end
  end
  setup_for_macosx_framework(tclver, tkver) if tcl_cfg_dir && tk_cfg_dir
end

# name of  Tcl/Tk libraries
tklib = with_config("tklib")
tcllib = with_config("tcllib")

# search X libraries
use_X = search_X_libraries


#---------------------------------------------------

if (TkLib_Config["tcltk-framework"] ||
      ( find_tcltk_header(tclver, tkver) &&
          find_tcltk_library(tcllib, tklib, stubs, tclver, tkver, 
                             tcl_ldir_list, tk_ldir_list) ) ) &&
    (stubs || pthread_check())
  # create Makefile

  # for SUPPORT_STATUS
  $INSTALLFILES ||= []
  $INSTALLFILES << ["lib/tkextlib/SUPPORT_STATUS", "$(RUBYLIBDIR)", "lib"]

  # create
  $CPPFLAGS << %[ -DRUBY_VERSION=\\"#{RUBY_VERSION}\\"]
  $CPPFLAGS << %[ -DRUBY_RELEASE_DATE=\\"#{RUBY_RELEASE_DATE}\\"]

  create_makefile("tcltklib")

  puts "Find Tcl/Tk libraries. Make tcltklib.so which is required by Ruby/Tk."
else
  puts "Can't find proper Tcl/Tk libraries. So, can't make tcltklib.so which is required by Ruby/Tk."
end