diff --git a/.envrc b/.envrc
index c9293c0..9647de7 100644
--- a/.envrc
+++ b/.envrc
@@ -1,2 +1,2 @@
-use nix
+use flake --impure
 
diff --git a/.gitignore b/.gitignore
index a09c56d..86f9b6a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 /.idea
+/.devenv
+/.direnv
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..e248298
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,291 @@
+{
+  "nodes": {
+    "devenv": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nix": "nix",
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks"
+      },
+      "locked": {
+        "lastModified": 1688058187,
+        "narHash": "sha256-ipDcc7qrucpJ0+0eYNlwnE+ISTcq4m03qW+CWUshRXI=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "c8778e3dc30eb9043e218aaa3861d42d4992de77",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "v0.6.3",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1700979662,
+        "narHash": "sha256-AlS2tefQT6fBxWGKKkQNXh1HAyzlwBQ8P6AUMmI1mxw=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "6f824c3d294716db51fbf8d555af8b9514cdbec4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "lowdown-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1633514407,
+        "narHash": "sha256-Dw32tiMjdK9t3ETl5fzGrutQTzh2rufgZV4A/BbxuD4=",
+        "owner": "kristapsdz",
+        "repo": "lowdown",
+        "rev": "d2c2b44ff6c27b936ec27358a2653caaef8f73b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kristapsdz",
+        "repo": "lowdown",
+        "type": "github"
+      }
+    },
+    "nix": {
+      "inputs": {
+        "lowdown-src": "lowdown-src",
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-regression": "nixpkgs-regression"
+      },
+      "locked": {
+        "lastModified": 1676545802,
+        "narHash": "sha256-EK4rZ+Hd5hsvXnzSzk2ikhStJnD63odF7SzsQ8CuSPU=",
+        "owner": "domenkozar",
+        "repo": "nix",
+        "rev": "7c91803598ffbcfe4a55c44ac6d49b2cf07a527f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "domenkozar",
+        "ref": "relaxed-flakes",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1678875422,
+        "narHash": "sha256-T3o6NcQPwXjxJMn2shz86Chch4ljXgZn746c2caGxd8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "126f49a01de5b7e35a43fd43f891ecf6d3a51459",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1678872516,
+        "narHash": "sha256-/E1YwtMtFAu2KUQKV/1+KFuReYPANM2Rzehk84VxVoc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9b8e5abb18324c7fe9f07cb100c3cd4a29cda8b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1700851152,
+        "narHash": "sha256-3PWITNJZyA3jz5IGREJRfSykM6xSLmD8u5A3WpBCyDM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1216a5ba22a93a4a3a3bfdb4bff0f4727c576fcc",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-23.05",
+        "type": "indirect"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "flake-utils": "flake-utils",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1686050334,
+        "narHash": "sha256-R0mczWjDzBpIvM3XXhO908X5e2CQqjyh/gFbwZk/7/Q=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "6881eb2ae5d8a3516e34714e7a90d9d95914c4dc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "fenix": "fenix",
+        "nixpkgs": "nixpkgs_2",
+        "utils": "utils"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1700937652,
+        "narHash": "sha256-sHczfsDUYH1CXPqNztnWH0gFo7xU0AuqQD96qSVC2HI=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "79ec2c584b990a533f7fde685a51d45d2a896103",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..1ff65b2
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,81 @@
+{
+  description = "Hornbeam";
+
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+    # Current Rust in nixpkgs is too old unfortunately — let's use the Fenix overlay's packages...
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    nixpkgs.url = "nixpkgs/nixos-23.05";
+
+    devenv.url = "github:cachix/devenv/v0.6.3";
+  };
+
+  outputs = inputs @ { self, nixpkgs, utils, fenix, devenv }:
+    utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages."${system}";
+
+      fenixRustToolchain =
+        fenix.packages."${system}".stable.withComponents [
+          "cargo"
+          "clippy"
+          "rust-src"
+          "rustc"
+          "rustfmt"
+          "rust-analyzer"
+        ];
+    in rec {
+      # `nix develop`
+      devShell = devenv.lib.mkShell {
+        inherit inputs pkgs;
+        modules = [
+          {
+            # Configure packages to install.
+            # Search for package names at https://search.nixos.org/packages?channel=unstable
+            packages = [
+              fenixRustToolchain
+              pkgs.gcc
+
+              # Snapshot testing
+              pkgs.cargo-insta
+
+              # Releasing a full workspace of packages
+              pkgs.cargo-workspaces
+
+              pkgs.grass-sass
+              pkgs.entr
+
+              # TODO Future pkgs.mdbook
+
+              pkgs.pkg-config
+            ];
+
+            env = {
+              # Needed for bindgen when binding to avahi
+              LIBCLANG_PATH="${pkgs.llvmPackages_latest.libclang.lib}/lib";
+
+              # Sometimes useful for reference.
+              RUST_SRC_PATH = "${fenixRustToolchain}/lib/rustlib/src/rust/library";
+
+              # Cargo culted:
+              # Add to rustc search path
+              #RUSTFLAGS = (builtins.map (a: ''-L ${a}/lib'') [
+              #]);
+              # Add to bindgen search path
+              BINDGEN_EXTRA_CLANG_ARGS =
+                # Includes with normal include path
+                (builtins.map (a: ''-I"${a}/include"'') [
+#                   pkgs.glibc.dev
+                ])
+                # Includes with special directory paths
+                ++ [
+#                   ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
+                ];
+            };
+          }
+        ];
+      };
+    });
+}