Can't find LSCM in uv unwrap

Hi all,
The title says it all… I am using blender 2.5, but there does not seem to be LSCM option in the unwrap menu… Is it an addon or something? Or is it called something else…
Thanks for help…

It’s gone. Unwrap, then press f6 for options beyond what you see in the main unwrap menu. I think conformal is the same as LSCM…Least Squares Conformal Map?

Cheers… Think f6 is answer… Will try again in a while…