anchor.diff:      PortMode = case OS of
   		   {unix, darwin} -> false;
   		   {unix, freebsd} -> false;
  +		   {unix, dragonfly} -> false;
   		   % Linux supports this.
   		   {unix, linux} -> true;
   		   {unix, openbsd} -> true;
  
positive.code: 	     %% corr. unless setrlimit() set
  	     {system_total_memory, Total}];
  	{unix, freebsd} ->
  	    [{total_memory, Total}, {free_memory, Total-Alloc},
  	     {system_total_memory, Total}];
  	{unix, darwin} ->
  
negative.code: get_os_wordsize({unix, darwin})  -> get_os_wordsize_with_uname();
  get_os_wordsize({unix, netbsd})  -> get_os_wordsize_with_uname();
  get_os_wordsize({unix, freebsd}) -> get_os_wordsize_with_uname();
  get_os_wordsize({unix, dragonfly}) -> get_os_wordsize_with_uname();
  get_os_wordsize({unix, openbsd}) -> get_os_wordsize_with_uname();
  get_os_wordsize(_)               -> unsupported_os.
  
  