anchor.diff:      Config.
   
   raw_tmpdir(_Config) ->
  -    UnixTmpdir = os:getenv("TMPDIR", "/tmp"),
       case rebar_file_utils:system_tmpdir() of
  -        UnixTmpdir -> ok;
  -        "./tmp"    -> ok
  +        ?TMPDIR -> ok;
  +        "./tmp" -> ok
       end.
   
   empty_tmpdir(_Config) ->
  -    UnixTmpdir = os:getenv("TMPDIR", "/tmp"),
       case rebar_file_utils:system_tmpdir([]) of
  -        UnixTmpdir -> ok;
  -        "./tmp"    -> ok
  +        ?TMPDIR -> ok;
  +        "./tmp" -> ok
       end.
   
   simple_tmpdir(_Config) ->
  -    UnixTmpdir = os:getenv("TMPDIR", "/tmp") ++ "/test",
       case rebar_file_utils:system_tmpdir(["test"]) of
  -        UnixTmpdir   -> ok;
  -        "./tmp/test" -> ok
  +        ?TMPDIR ++ "/test" -> ok;
  +        "./tmp/test"       -> ok
       end.
   
   multi_tmpdir(_Config) ->
  -    UnixTmpdir = os:getenv("TMPDIR", "/tmp") ++ "/a/b/c",
       case rebar_file_utils:system_tmpdir(["a", "b", "c"]) of
  -        UnixTmpdir    -> ok;
  -        "./tmp/a/b/c" -> ok
  +        ?TMPDIR ++ "/a/b/c" -> ok;
  +        "./tmp/a/b/c"       -> ok
       end.
   
   reset_nonexistent_dir(Config) ->
  
positive.code: -include_lib("eunit/include/eunit.hrl").
  -include_lib("kernel/include/file.hrl").
  
  
  all() ->
      [{group, tmpdir},
  
negative.code: 
  init_per_group(reset_dir, Config) ->
      TmpDir = rebar_file_utils:system_tmpdir(["rebar_file_utils_SUITE", "resetable"]),
      [{tmpdir, TmpDir} | Config];
  init_per_group(tmpdir, Config) ->
      PreviousTmpDir = os:getenv("TMPDIR"),
      os:putenv("TMPDIR", ?TMPDIR),
      [{previous_tmp, PreviousTmpDir} | Config];
  init_per_group(_, Config) -> Config.
  
  end_per_group(tmpdir, Config) ->
      case ?config(previous_tmp, Config) of
          false -> os:unsetenv("TMPDIR");
          Val -> os:putenv("TMPDIR", Val)
      end,
      Config;
  end_per_group(_, Config) -> Config.
  
  init_per_testcase(Test, Config) ->
  