def windows_stub_script(bindir, bin_file_name)
    ruby = File.basename(Gem.ruby).chomp('"')
    return <<-TEXT
@ECHO OFF
IF NOT "%~f0" == "~f0" GOTO :WinNT
@"#{ruby}" "#{File.join(bindir, bin_file_name)}" %1 %2 %3 %4 %5 %6 %7 %8 %9
GOTO :EOF
:WinNT
@"#{ruby}" "%~dpn0" %*
TEXT

  end
#
return the stub script text used to launch the true ruby script