Can't build a ghc cloned from github

[Bryan O'Sullivan]

There appears to be a bad ref on the server for the Cabal repo:

== running git submodule update
error: Unable to find b4d0c0f2846542dc2e2df189fe145a56ac9b30b6 under
http://darcs.haskell.org/libraries/Cabal.git
Cannot obtain needed object b4d0c0f2846542dc2e2df189fe145a56ac9b30b6
while processing commit e7e7ce1029707a67d26e6dc29de11141734898e3.
error: Fetch failed.
Unable to fetch in submodule path 'libraries/Cabal'
git failed: 256 at ./sync-all line 116.
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