diff --git a/.vim.custom b/.vim.custom
index 7444394..14785cb 100644
--- a/.vim.custom
+++ b/.vim.custom
@@ -1,14 +1,5 @@
 function s:hdevtools_options(rgs)
-	return join(map(a:rgs, "'-g ' . v:val"))
-endfunction
-
-function s:discover_cabal_sandbox(glob)
-	let l:sandboxes = split(glob(a:glob, "."), "\n")
-	if len(l:sandboxes) > 0
-		return ['-no-user-package-db', '-package-db=' . l:sandboxes[-1]]
-	else
-		return []
-	endif
+	return join(["-s", "/tmp/" . substitute(system("sha1sum <<< $PWD | cut -d' ' -f1"), '\n\+$', '', '') . ".sock"] + map(a:rgs, "'-g ' . v:val"))
 endfunction
 
 let g:syntastic_haskell_hdevtools_args = s:hdevtools_options
@@ -23,5 +14,5 @@ let g:syntastic_haskell_hdevtools_args = s:hdevtools_options
 	\ , '-Wall'
 	\ , '-fno-warn-unused-do-bind'
 	\ , '-fno-warn-type-defaults'
-	\ ] + s:discover_cabal_sandbox(".cabal-sandbox/*.conf.d")
+	\ ]
 	\ )
diff --git a/default.nix b/default.nix
index a3d9051..3656fcf 100644
--- a/default.nix
+++ b/default.nix
@@ -1,2 +1,9 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }:
-nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./ldap-client.nix {}
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }: let
+  ghc = nixpkgs.pkgs.haskell.packages.${compiler};
+  npm = import ./npm {};
+in
+  ghc.callPackage ./package.nix {
+    mkDerivation = args: ghc.mkDerivation(args // {
+      buildTools = (if args ? buildTools then args.buildTools else []) ++ [ npm.nodePackages.ldapjs ];
+    });
+  }
diff --git a/ldap-client.nix b/package.nix
similarity index 100%
rename from ldap-client.nix
rename to package.nix
diff --git a/shell.nix b/shell.nix
index 99cb495..29656cc 100644
--- a/shell.nix
+++ b/shell.nix
@@ -4,8 +4,8 @@
     ps.hdevtools ps.doctest ps.hspec-discover ps.hlint ps.ghc-mod
   ]);
   cabal-install = pkgs.haskell.packages.${compiler}.cabal-install;
-  pkg = (import ./default.nix { inherit nixpkgs compiler; });
-  npm = (import ./npm {});
+  pkg = import ./default.nix { inherit nixpkgs compiler; };
+  npm = import ./npm {};
 in
   pkgs.stdenv.mkDerivation rec {
     name = pkg.pname;