anchor.diff:  REM ============================================
   
   set NSIS_EXEC="%PROGRAMFILES%\NSIS\makensis.exe"
  -echo   Assuming NSIS at default location %NSIS_EXEC%
  +if not exist "%PROGRAMFILES%\NSIS\makensis.exe" echo   NSIS couldn't be found at default location %NSIS_EXEC%
  +if not exist "%PROGRAMFILES%\NSIS\makensis.exe" goto Abort
  +echo   Found NSIS at default location %NSIS_EXEC%
   
   
   echo:
  
positive.code: echo Retrieving version/revision information
  REM ============================================
  if not exist include/gpac/version.h echo   version couldn't be found - check include/gpac/version.h exists
  if not exist include/gpac/version.h goto abort
  
  REM execute svnversion and check if the result if found within version.h
  for /f "delims=" %%i in ('svnversion.exe') do Set VarRevisionSVN=%%i
  
negative.code: REM ============================================
  echo Windows GPAC installer generated - goodbye!
  REM ============================================
  goto LeaveBatch
  
  :RevisionAbort
  echo   SVN revision "%VarRevisionSVN%" is not a simple number, you may have local modification (please check 'svnrevision' flags meaning or execute the NSIS script manually)
  
  :Abort
  echo:
  echo  *** ABORTING: CHECK ERROR MESSAGES ABOVE ***
  
  :LeaveBatch
  set VarRevisionSVN=
  set VarRevisionBuild=
  cd /d %OLDDIR%
  