anchor.diff:  	7z x boost_1_68_0.7z | find "ing archive"
   	cd boost_1_68_0
   	call .\bootstrap.bat
  -	call .\b2.exe --prefix=%BOOST_ROOT% toolset=msvc-14.0 variant=release link=static threading=multi runtime-link=static define=BOOST_USE_WINAPI_VERSION=0x0501 cxxflags="/Zc:threadSafeInit- " --with-date_time --with-filesystem --with-locale --with-regex --with-system --with-thread -q -d0 install
  +	call .\b2.exe --prefix=%BOOST_ROOT% %boost_build_options% -q -d0 install
   	xcopy /e /i /y /q %BOOST_ROOT%\include\boost-1_68\boost %BOOST_ROOT%\boost
   	popd
   	if %ERRORLEVEL% NEQ 0 goto ERROR
  
positive.code: 	echo.
  	echo Thirdparty libraries installed.
  	echo.
  	goto EXIT
  ) else (
  	echo.
  	echo Last build date of cache is
  	type thirdparty.cached
  	echo.
  	goto EXIT
  )
  
  :ERROR
  set EXITCODE=%ERRORLEVEL%
  
  :EXIT
  exit /b %EXITCODE%
  
negative.code: setlocal
  
  set boost_build_options=toolset=msvc-14.0^
   variant=release^
   link=static^
   threading=multi^
   runtime-link=static^
   define=BOOST_USE_WINAPI_VERSION=0x0501^
   cxxflags="/Zc:threadSafeInit- "^
   --with-date_time^
   --with-filesystem^
   --with-locale^
   --with-regex^
   --with-system^
   --with-thread
  
  set nocache=0
  
  