diff --git a/shell.nix b/shell.nix
index 61d18d9..0348d51 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,38 +1,35 @@
-# shell.nix
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:
+
 let
-  project = import ./default.nix;
+
+  inherit (nixpkgs) pkgs;
+
+  f = { mkDerivation, base, directory, filepath, hakyll, HTTP, lib
+      , time
+      }:
+      mkDerivation {
+        pname = "nek0-blog";
+        version = "0.1.0.0";
+        src = ./.;
+        isLibrary = false;
+        isExecutable = true;
+        executableHaskellDepends = [
+          base directory filepath hakyll HTTP time
+        ];
+        homepage = "https://nek0.eu";
+        description = "My blog";
+        license = "unknown";
+        hydraPlatforms = lib.platforms.none;
+      };
+
+  haskellPackages = if compiler == "default"
+                       then pkgs.haskellPackages
+                       else pkgs.haskell.packages.${compiler};
+
+  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;
+
+  drv = variant (haskellPackages.callPackage f {});
+
 in
-  project.shellFor {
-    # ALL of these arguments are optional.
 
-    # List of packages from the project you want to work on in
-    # the shell (default is all the projects local packages).
-    #packages = ps: with ps; [
-    #  pkga
-    #  pkgb
-    #];
-
-    # Builds a Hoogle documentation index of all dependencies,
-    # and provides a "hoogle" command to search the index.
-    withHoogle = false;
-
-    # Some common tools can be added with the `tools` argument
-    tools = {
-      cabal = "latest";
-      hakyll = "latest";
-    };
-    # See overlays/tools.nix for more details
-
-    # Some you may need to get some other way.
-    buildInputs = [ (import <nixpkgs> {}).git ];
-
-    # Sellect cross compilers to include.
-    #crossPlatforms = ps: with ps; [
-    #  ghcjs      # Adds support for `js-unknown-ghcjs-cabal build` in the shell
-    #  # mingwW64 # Adds support for `x86_64-W64-mingw32-cabal build` in the shell
-    #];
-
-    # Prevents cabal from choosing alternate plans, so that
-    # *all* dependencies are provided by Nix.
-    exactDeps = true;
-  }
+  if pkgs.lib.inNixShell then drv.env else drv