fixed nix config

release.nix

@@ -0,0 +1,16 @@
+let
+  compiler = "ghc884";
+  rev  = "b78e08e981a9ad31036fc6c6fb880c1315b4ebea";
+  overlay = _: pkgs: {
+    haskellPackages = pkgs.haskellPackages.override {
+      overrides = self: super: rec {
+        achille = self.callPackage ../achille/achille.nix {};
+      };
+    };
+  };
+  nixpkgs =
+    import (builtins.fetchTarball {
+      url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
+    }) { overlays = [ overlay ] ; };
+
+in nixpkgs.haskellPackages.callPackage ./site.nix {}

site.nix

@@ -0,0 +1,19 @@
+{ mkDerivation, achille, aeson, base, binary, bytestring
+, containers, data-default, directory, feed, filepath, lucid
+, optparse-applicative, pandoc, pandoc-types, process, sort, stdenv
+, text, time, yaml
+}:
+mkDerivation {
+  pname = "site";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    achille aeson base binary bytestring containers data-default
+    directory feed filepath lucid optparse-applicative pandoc
+    pandoc-types process sort text time yaml
+  ];
+  license = "unknown";
+  hydraPlatforms = stdenv.lib.platforms.none;
+}