build fail with latest 8.1 sources

[John Leo]

Hi everyone,

I'm trying to build the latest 8.1 sources on a Mac running El Capitan.
I'm getting an error I'd never seen before and wonder if anyone has any
pointers of how I might fix things.  I blew away my GHC, re-cloned from
github, reconfigured and I still get the same error.

The following are the relevant output lines; the problem is that the
template-haskell version doesn't seem to match.  I'm not sure whether this
is coming from the template-haskell in 8.1 or in 8.0.1 (which I'm using to
build 8.1), but checking the latter I have version 2.11.0.0 which I assume
should be sufficient.

John

--------------------

Configuring ghc-pkg-6.9...
Configuring ghc-8.1...
ghc-cabal: Encountered missing dependencies:
template-haskell ==2.11.* && ==2.12.0.0
make[1]: *** [compiler/stage1/package-data.mk] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2

----------------

internal-229:~/haskell/ghc> cabal update

                      (git)-[master]
Downloading the latest package list from hackage.haskell.org
Skipping download: local and remote files match.
internal-229:~/haskell/ghc> cabal install template-haskell

                      (git)-[master]
Resolving dependencies...
All the requested packages are already installed:
template-haskell-2.11.0.0
Use --reinstall if you want to reinstall anyway.
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