anchor.diff:      cmd /c bootstrap.bat
   )
   
  -cmd /c "b2.exe" --toolset=msvc-%MSVC_VERSION%.0 --with-serialization --with-iostreams --with-program_options --with-system --with-thread --with-filesystem --with-log --with-python --with-test --with-date_time variant=debug,release link=shared runtime-link=shared threading=multi define=_SCL_SECURE_NO_WARNINGS=0 define=_ITERATOR_DEBUG_LEVEL=0
  +cmd /c "b2.exe" --toolset=msvc-%MSVC_VERSION%.0 --with-serialization --with-iostreams --with-program_options --with-system --with-thread --with-filesystem --with-log --with-python --with-test --with-date_time variant=debug,release link=shared runtime-link=shared threading=multi define=HAVE_ROUND define=_SCL_SECURE_NO_WARNINGS=0
   
   if not exist %VENDOR_DIR%include\boost (
       xcopy "boost" "%VENDOR_DIR%include\boost" /s /i /y
  
positive.code: set "PROJECT_DRIVE=%~d0"
  set "BUILD_DIR=%PROJECT_BASE%build\deps\"
  set "VENDOR_DIR=%PROJECT_BASE%vendor\"
  set MSVC_VERSION=11
  set BOOST_VERSION=1.54.0
  set BOOST_LOG_REVISION=737
  set TURTLE_VERSION=1.2.0
  
negative.code:     exit /b 1
  )
  
  if not exist "!VS%MSVC_VERSION%0COMNTOOLS!" (
      echo ***** Microsoft Visual Studio %MSVC_VERSION% required *****
      exit /b 1
  )
  
  call "!VS%MSVC_VERSION%0COMNTOOLS!\vsvars32.bat" >NUL
  
  set environment_built=yes
  
  