The .cabal lists the version as pre3, but I think I just recently
pulled the "tag rc1" path.

Anyway, after running "./configure --prefix=${MY-PREFIX}" without
error, I attempted the following:

$ make && make install
Rebuild dependencies ...

src/Darcs/Bug.lhs:9:7:
    Could not find module `Text.Regex':
      Use -v to see a list of the files searched for.
make: *** [.depend] Error 1

This is on Ubuntu 8.04 Beta, with the Ubuntu packages for GHC 6.8.2
installed.  The core install of GHC on Ubuntu does NOT include any of
the following packages:

 regex-compat
 regex-base
 regex-posix

-Antoine