[Pkg-haskell-maintainers] How to bootstrap alex?

[Samuel Thibault]

Hello,

alex build-depends on itself. Dropping the dependency does not seem
enough to break the loop, I'm ending up with 

Building alex-3.0.1...
Preprocessing executable 'alex' for alex-3.0.1...
hlibrary.setup: The program alex is required but it could not be found

How to bootstrap it? I have installed the build-deps on the
DD-accessible exodar.debian.net sid chroot.

Samuel