anchor.diff:  
   :: usage: call:build x86|x64|ia64 debug|release
   :build
  +@echo ==== Building %~1 %~2 ====
   call:configureWinSDK %~1 %~2
   set BUILD_DIR=%~dp0build\boost_%BOOST_VERSION%-%~1
   if not exist "%BUILD_DIR%" call:extractSource %BUILD_DIR%
  
positive.code: 
  :: usage: call:bootstrap boost_dir
  :bootstrap
  @echo ==== Bootstrapping Boost %~1 ====
  pushd "%~1"
  call bootstrap.bat
  popd
  
negative.code:   set SOURCE_FILE=%SOURCE_DIR%\boost_%BOOST_VERSION%.7z
  )
  if not exist "%~1" (
    @echo Extracting "%SOURCE_FILE%" to "%~1"
    "%ZIP7%" x -o"%~1" "%SOURCE_FILE%" > nul
    if errorlevel 1 (
  