anchor.diff:  exit
   
   :bindirset
  -if exist %BINDIR%\*.* goto bindirexists
  +if exist "%BINDIR%\*.*" goto bindirexists
   echo The BINDIR environment variable must point to an existing directory
   echo to be able to perform the installation procedure.
   exit
  
positive.code: exit
  
  :libdirset
  if exist %LIBDIR%\*.* goto libdirexists
  echo The LIBDIR environment variable must point to an existing directory
  echo to be able to perform the installation procedure.
  exit
  
negative.code: exit
  
  :includedirset
  if exist "%INCLUDEDIR%\*.*" goto includedirexists
  echo The INCLUDEDIR environment variable must point to an existing directory
  echo to be able to perform the installation procedure.
  exit
  