Thanks - however that doesn't really solve my problem.

I'm trying to write a function which deduces the install sequence for a given module and its prerequisites (to feed to dh-make-perl). This function generates a list of distribution names. Unfortunately, CPANPLUS then can't install some of the distributions listed, even though it gave me the names in the first place!

So although I could try and get the information elsewhere, or cobble the module names into the list, I'd rather just ask CPANPLUS, and I think it really ought to be able to tell me...