anchor.diff:  rem --- Start of BUILD_ENVIRONMENT ---------------------------------------------
   :BUILD_ENVIRONMENT
   
  -call where svn /Q | findstr /c:"svn.exe" >nul && (
  -    echo ***** SVN required and not found in system PATH *****
  -    exit /b 1
  -)
  -
   call where git /Q | findstr /c:"git.exe" >nul && (
       echo ***** Git required and not found in system PATH *****
       exit /b 1
  
positive.code: set "VENDOR_DIR=%PROJECT_BASE%vendor\"
  set MSVC_VERSION=11
  set BOOST_VERSION=1.52.0
  set TURTLE_VERSION=1.2.0
  set GLM_VERSION=0.9.4.1
  set ZLIB_VERSION=1.2.7
  
negative.code: )
  
  if not exist boost-log (
      git svn clone -r %BOOST_LOG_REVISION% https://boost-log.svn.sourceforge.net/svnroot/boost-log/trunk/boost-log
  )
  
  if not exist "%BOOST_DIR%\boost\log" (
  