[Yhc] What does Yhc need (error, ffi.h not found)

[Neil Mitchell]

> Darcs manual says:
>
> email
> The _darcs/prefs/email file is used to provide the e-mail address for
> your repository that others will use when they darcs send a patch back
> to you. The contents of the file should simply be an e-mail address.

Done, see:
http://www.cs.york.ac.uk/fp/darcs/yhc-devel/_darcs/prefs/email

A darcs pull doesn't seem to pull that information though, so I guess
only new repo's will have it - but useful to have.

Thanks

Neil