added basic example

.gitignore

@@ -0,0 +1 @@
+result

custom/zig.nix

@@ -0,0 +1,62 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, llvmPackages
+, libxml2
+, zlib
+}:
+
+stdenv.mkDerivation rec {
+  pname = "zig";
+  version = "0.9.1";
+
+  src = fetchFromGitHub {
+    owner = "ziglang";
+    repo = pname;
+    rev = version;
+    hash = "sha256-x2c4c9RSrNWGqEngio4ArW7dJjW0gg+8nqBwPcR721k=";
+  };
+
+  # Fix index out of bounds reading RPATH (cherry-picked from 0.10-dev)
+  patches = [ ./rpath.patch ];
+
+  nativeBuildInputs = [
+    cmake
+    llvmPackages.llvm.dev
+  ];
+
+  buildInputs = [
+    libxml2
+    zlib
+  ] ++ (with llvmPackages; [
+    libclang
+    lld
+    llvm
+  ]);
+
+  preBuild = ''
+    export HOME=$TMPDIR;
+  '';
+
+  cmakeFlags = [
+    # file RPATH_CHANGE could not write new RPATH
+    "-DCMAKE_SKIP_BUILD_RPATH=ON"
+  ];
+
+  doCheck = true;
+  checkPhase = ''
+    runHook preCheck
+    ./zig test --cache-dir "$TMPDIR" -I $src/test $src/test/behavior.zig
+    runHook postCheck
+  '';
+
+  meta = with lib; {
+    homepage = "https://ziglang.org/";
+    description =
+      "General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software";
+    license = licenses.mit;
+    maintainers = with maintainers; [ aiotter andrewrk AndersonTorres ];
+    platforms = platforms.unix;
+  };
+}

flake.lock

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+{
+  "nodes": {
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      },
+      "locked": {
+        "lastModified": 1666887363,
+        "narHash": "sha256-+bs3z5wk57MHmqTELsx62jrySYJbiWfQIW+Tj79oNGI=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "d3f21617acace32097a53b0b74fb5000d333d094",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1662996720,
+        "narHash": "sha256-XvLQ3SuXnDMJMpM1sv1ifPjBuRytiDYhB12H/BNTjgY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5f326e2a403e1cebaec378e72ceaf5725983376d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1666703756,
+        "narHash": "sha256-GwpMJ1hT+z1fMAUkaGtvbvofJQwdVFDEGVhfE82+AUk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f994293d1eb8812f032e8919e10a594567cf6ef7",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "home-manager": "home-manager",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Question about home-manager.";
+
+  inputs = {
+    home-manager.url = "github:nix-community/home-manager";
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs = { home-manager, nixpkgs, self,... }:
+    let
+      ubuntuSystem = home-manager.lib.homeManagerConfiguration {
+        pkgs = nixpkgs.legacyPackages.x86_64-linux ;
+        modules = [
+          {
+            nixpkgs = {
+              config = { allowUnfree = true; };
+            };
+            imports = [./ubuntu.nix];
+          }
+          {
+            home = {
+              username = "didier";
+              homeDirectory = "/home/didier";
+              stateVersion = "22.11";
+            };
+          }
+        ];
+      };
+      in 
+        {
+          defaultPackage.x86_64-linux = ubuntuSystem.activationPackage;
+        };
+}

ubuntu.nix

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+# Home manager options: https://nix-community.github.io/home-manager/options.html
+
+{config
+, pkgs
+,...}: 
+{
+  home.packages = with pkgs; [clojure jq];
+}