anchor.diff:  @rem # Use environment variables or a file if available.
   @rem # Otherwise the latest Python by default.
   if not defined PYTHON_EXECUTABLE (
  -    @rem # check for a file named PYTHON_EXECUTABLE 
  +    @rem # check for a file named PYTHON_EXECUTABLE
       if exist ""%CFG_ROOT_DIR%\PYTHON_EXECUTABLE"" (
           set /p PYTHON_EXECUTABLE=<""%CFG_ROOT_DIR%\PYTHON_EXECUTABLE""
       ) else (
  
positive.code: 
  
  @rem ################################
  @rem # Set the quiet flag to empty if not defined 
  if not defined CFG_QUIET (
      set "CFG_QUIET= "
  )
  
negative.code: 
  
  @rem ################################
  @rem # A configuration script to set things up:
  @rem # create a virtualenv and install or update thirdparty packages.
  @rem # Source this script for initial configuration
  @rem # Use configure --help for details
  