GHC build failure

[Herbert Valerio Riedel]

On 2015-06-11 at 16:37:47 +0200, Wolfgang Jeltsch wrote:
> I just updated my GHC HEAD copy via git pull and tried to rebuild GHC
> with BuildFlavour set to devel2. I got the following error message:
>
>     ghc/InteractiveUI.hs:68:8: error:
>         Could not find module ‘Control.DeepSeq’
>         It is a member of the hidden package
>         ‘deepseq-1.4.1.1 at deeps_6vMKxt5sPFR0XsbRWvvq59’.
>         Use -v to see a list of the files searched for.
>
> Any ideas what to do?

...have you ./boot'ed and ./configure'd again (and to be on the safe
side, also 'make distclean')? This sounds as if your ghc/ghc-bin.cabal
wasn't regenerated from the .in file...