Bundle bootstrap as nix flake package.

.gitignore

@@ -1,6 +1,17 @@
+# Directory used by clangd LSP.
 .cache/
+
+# Directory used by `direnv` to hold `use flake`-generated profiles.
 .direnv/
-bootstrap
+
+# The compilation database produced by `bear`.
 compile_commands.json
+
+# The directory containing all build outputs.
 dist/
+
+# The directory generated by `Doxygen`.
 docs/
+
+# A symlink produced by default when running `nix build`.
+result

flake.nix

@@ -19,20 +19,20 @@
       in
       {
         packages = {
-          bootstrap = pkgs.stdenv.mkDerivation {
+          release = pkgs.stdenv.mkDerivation {
             pname = "bootstrap";
             src = ./.;
             version = "0.1.0";
-            nativeBuildInputs = with pkgs; [
-              clang
-            ];
-
-            buildPhase = ''
-              make release
-            '';
+            makeFlags = [ "BUILD=release" "PREFIX=$(out)" ];
+            dontInstall = true;
           };
 
-          default = self.packages.${system}.bootstrap;
+          default = pkgs.writeShellScriptBin "bootstrap" ''
+            if [ -z "$BOOTSTRAP_ROOT_DIR" ]; then
+              export BOOTSTRAP_ROOT_DIR="${./specs}"
+            fi
+            exec ${self.packages.${system}.release}/bootstrap "$@"
+          '';
         };
         devShells.default = pkgs.mkShell.override {
           # https://nixos.wiki/wiki/Using_Clang_instead_of_GCC