I had configured stack as a system package on NixOS/Plasma. That provided stack –version of 3.9.3 x86_64 hpack-0.39.1, the NixOS project’s version of Stack 3.9.3. On NixOS, Stack’s nix: enable configuration option defaults to true. That means that Stack uses Nix to manage GHC versions and builds, by default, in a pure Nix shell. Building […]