Doesn't work on macOS Big Sur
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neongreen commented
We need newer nixpkgs for Big Sur to work around an ld issue. However, the latest nixpkgs is too new and features alex 3.2.6. I have used a random commit from Dec 4 and got it working:
niv update nixpkgs -r daf9fa3518ded8e053103f3679255c174c6dd77a
Also should use nix-shell ghc.nix --arg withGrind false because valgrind is marked as broken.