anchor.diff:  SET R_MAJOR_VERSION=3
   SET R_FULL_VERSION=3.1.2
   SET RTOOLS_BIN_DIR=C:\Rtools\bin
  +SET TMPDIR=C:\tmp
   
   REM Note: Tool path must use forward slashes, and
   REM should end with a trailing slash.
  
positive.code: REM plus some other libraries.
  xcopy /E C:\R64 %ROOT_DIR%\R-%R_FULL_VERSION%
  
  REM Set the environment variable 'TMPDIR' to the absolute path
  REM of a writable directory, with a path specified with forward slashes.
  SET TMPDIR=C:/tmp
  
  cd R-%R_FULL_VERSION%\src\gnuwin32
  
  
negative.code: set NL=^^^%NLM%%NLM%^%NLM%%NLM%
  
  REM Set the current directory.
  if not exist "%ROOT_DIR%" mkdir "%ROOT_DIR%"
  cd "%ROOT_DIR%"
  
  SET OLDPATH=%PATH%
  