anchor.diff:  
   :: usage: call:configureWinSDK x86|x64|ia64 debug|release [/vista^|/xp^|/2003^|/2008^|/win7]
   :configureWinSDK
  -@echo ==== Configuring WinSDK %~1 %~2 %~3 ====
   set TARGET_ARCH=/%1
   set MODE=/%2
   if "%3" == "" ( set TARGET_OS=/xp ) else set TARGET_OS=%3
  
positive.code:   set SOURCE_FILE=%SOURCE_DIR%\boost_%BOOST_VERSION%.7z
  )
  if not exist "%~1" (
    @echo ==== Extracting Boost Source ====
    @echo Extracting "%SOURCE_FILE%" to "%~1"
    "%ZIP7%" x -o"%~1" "%SOURCE_FILE%" > nul
    if errorlevel 1 (
  
negative.code: 
  :: usage: call:bootstrap boost_dir
  :bootstrap
  @echo Bootstrapping %~1
  pushd "%~1"
  call bootstrap.bat
  popd
  