anchor.diff:  
   if EXIST ..\bin\nul call:failure -1 "Do not run scripts from bin directory!"
   if "%failure%" neq "0" goto:eof
  +
  +where perl > NUL 2>&1
  +if %errorlevel% equ 1 (
  +	echo.
  +	echo ================================================================================
  +	echo.
  +	echo Warning! Warning! Warning! Warning! Warning! Warning! Warning!
  +	echo.
  +	echo Perl is missing.
  +	echo You need to have installed Perl to build projects properly.
  +	echo Use the 32-bit perl from Strawberry http://strawberryperl.com/ to avoid possible linking errors and incorrect assember files generation. 
  +	echo Download URL: http://strawberryperl.com/download/5.22.1.2/strawberry-perl-5.22.1.2-32bit.msi
  +	echo Make sure that the perl path from Strawberry appears at the beginning of all other perl paths in the PATH 
  +	echo.
  +	echo ================================================================================
  +	echo.
  +	
  +	call:failure -1 "Perl has to be installed before running prepare script!"
  +	if "%failure%" neq "0" goto:eof
  +)
   
   call:doprepare libs\webrtc ..\..\bin\prepare-webrtc.bat WebRTC winrt
   if "%failure%" neq "0" goto:eof
  
positive.code: popd > NUL
  if "%failure%" neq "0" goto:eof
  
  
  goto:eof
  
  
  :failure
  echo.
  echo ERROR: %~2
  echo.
  echo FAILURE: Could not prepare ortc-lib-sdk.
  
  
negative.code: 
  	echo Updating projects ...
  	if EXIST .\bin\ninja.exe start /B /wait .\bin\upn.exe .\bin\ .\libs\webrtc\ .\libs\webrtc\chromium\src\
  )
  
  goto:done
  