`tmpname' not supported?

[PA <petite.abeille@...>]

Hello,

I would like to use os.tmpname(), but I get this exception:

stack traceback:
        [C]: in function `tmpname'
        ./LUFile.lua:220: in function `tmpFile'
        Example.lua:236: in main chunk
        [C]: ?

Is there a way to enable os.tmpname()?

Alternatively, is there another way to figure out the location of the 
tmp directory in a platform agnostic way?

For the record I'm using lua-5.1-work4.

Thanks!

Cheers

--
PA, Onnay Equitursay
http://alt.textdrive.com/