You need to run `git submodule update` I think.

On Wed, Mar 15, 2023 at 12:36 PM Simon Peyton Jones
<simon.peytonjones@gmail.com> wrote:
>
> Aargh!  I can't build HEAD!
>
> I get this:
> ./hadrian/build
> Up to date
> ]0;Starting... ]0;Finished in 0.04s Error, file does not exist and no rule available:
>   utils/hpc/hpc-bin.cabal
> Build failed.
>
>
> This is after
> hadrian/build clean
> ./boot
> ./configure
>
> I'm very stalled.  All my trees are borked.  Can anyone help?
>
> Simon