GHC HEAD compile failure at ghctags: "missing: Cabal >=1.25 && <1.27"

[Edward Z. Yang]

Don't forget to "git submodule update"

Edward

Excerpts from Conal Elliott's message of 2016-03-30 10:02:20 -0700:
> I'm trying to recompile GHC (via GHC 7.10.3) from freshly git-pulled HEAD,
> and "make" keeps dying at ghctags:
> 
>     Configuring ghctags-0.1...
>     ghc-cabal: At least the following dependencies are missing:
>     Cabal >=1.25 && <1.27
> 
> According to ghc-pkg I have Cabal 1.25.0.0 (compiled from a freshly
> git-pulled git clone).
> 
> Any ideas what's going on and how I can fix it?
> 
> Thanks.  - Conal