Adding System.FilePath

[Neil Mitchell]

Hi Duncan,

> With the exception of Cabal presumably.

Why?

I recently tried to install lhs2tex, of course this doesn't work
unless you share Cabal version with the author of the Setup.hs. Of
course, if you've got that one, a whole new set of programs break.

How far away is Cabal from presenting a stable interface? Is this not
a goal in the long run?

I realise Cabal is changing too fast at the moment, so perhaps apply
this rule to Cabal at some future date.

Thanks

Neil