Open
Description
See https://www.pism.io/docs/installation/macos.html.
This section is horribly out of date.
We should use https://github.com/pism/homebrew-pism, possibly creating a custom PETSc formula. (At the time of writing the PETSc formula in homebrew-core is broken by Homebrew/homebrew-core#167477, which should not have been merged).
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