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You can use the shell.nix from this directory to build the servant packages or even the tutorial or cookbook if you want to, optionally.

Just the servant packages:

$ nix-shell nix/shell.nix

Everything needed for the tutorial and the cookbook too:

$ nix-shell nix/shell.nix --arg tutorial true

The shell.nix file also supports specifying a particular ghc version, e.g:

$ nix-shell nix/shell.nix --argstr compiler ghcHEAD

The default is ghc92.

To check which which ghc compiler options are available:

$ nix-env -f nix/nixpkgs.nix -qaP -A haskell.compiler

If you prefer to use flakes, the flake.nix file provides an equivalent default devShell to shell.nix. In addition, the tutorial is provided as a separate flake output:

$ nix develop .#tutorial

Cabal users

GHC version can be chosen via the nix-shell parameter

cabal build all

Stack version

Since the ghc version is set by the LTS version, it is preferable to use the ghc8104 version parameter for the nix-shell.

stack --no-nix --system-ghc <command>