[petsc-dev] BuildSystem optional requirements

[Jed Brown]

On Sun, Jan 1, 2012 at 17:55, Matthew Knepley <knepley at gmail.com> wrote:

> This makes zero sense on its face. Why is the dependency conditional? It
> should be unconditional
> and then we check whether it was found. Change it!
>

It depends on *either* ParMetis or PTScotch. How do we specify that either
one is acceptable?
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