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

[Conal Elliott]

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
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