github.com_the-nix-way_dev-templates/clojure/flake.nix

{
  description = "A Nix-flake-based Clojure development environment";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:NixOS/nixpkgs";
  };

  outputs = { self, flake-utils, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        jdk = "jdk17";

        config = {
          packageOverrides = p: {
            boot = p.boot.override { jdk = p.${jdk}; };
            clojure = p.clojure.override { jdk = p.${jdk}; };
            leiningen = p.leiningen.override { jdk = p.${jdk}; };
          };
        };

        pkgs = import nixpkgs { inherit config system; };
        inherit (pkgs) boot clojure leiningen mkShell;
      in
      {
        devShells = {
          default = mkShell {
            buildInputs = [ boot clojure leiningen ];

            shellHook = ''
              ${clojure}/bin/clj --version
            '';
          };
        };
      });
}