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We used to say 10.3, but this gives
    -rpath can only be used when targeting Mac OS X 10.5 or later 
when building shared libraries.
Patch from mwotton.

rather than the "second" argument. Fixes trac #3505.

Spotted by Judah.

Haddock uses TcRnDriver.tcRnGetInfo, which is only available if
GHCI is built. Set HADDOC_DOCS to NO if GhcWithInterpreter is NO,
and disable the haddock build if HADDOC_DOCS = NO.

Cleaning should always succeed now

Add changes that we inherit from haskeline

This fixes at least one problem: libHSffi-ghc<version>.so wasn't being
cleaned, because $(dyn_libsuf) wasn't defined while cleaning.

 - remove the main: stuff
 - show the filenames
 - don't clutter the output with imports that aren't involved in
   the cycle

- Needed to get arch-dependent options, eg, on Snow Leopard

So that Cabal, if it wants, can use a more general algorithm to find a
consistent set of packages to use.