diff --git a/pkgs/development/libraries/dotnetfx40/default.nix b/pkgs/development/libraries/dotnetfx40/default.nix
new file mode 100644
index 000000000000..b9ce4738d129
--- /dev/null
+++ b/pkgs/development/libraries/dotnetfx40/default.nix
@@ -0,0 +1,23 @@
+{stdenv}:
+
+let
+  windir = "/cygdrive/c/WINDOWS";
+in
+{
+  pkg = stdenv.mkDerivation {
+    name = "dotnetfx-4.0";
+    src = "${windir}/Microsoft.NET/Framework/v4.0.30319";
+    buildCommand = ''
+      ensureDir $out/bin
+      ln -s $src/MSBuild.exe $out/bin
+    '';
+  };
+  
+  assembly20Path = "/cygdrive/c/WINDOWS/Microsoft.NET/Framework/v2.0.50727";
+  
+  wcfPath = "/cygdrive/c/WINDOWS/Microsoft.NET/Framework/v3.0/WINDOW~1";
+  
+  referenceAssembly30Path = "/cygdrive/c/PROGRA~1/REFERE~1/Microsoft/Framework/v3.0";
+  
+  referenceAssembly35Path = "/cygdrive/c/PROGRA~1/REFERE~1/Microsoft/Framework/v3.5";
+}