diff --git a/pkgs/development/python-modules/pivy/default.nix b/pkgs/development/python-modules/pivy/default.nix
index 4619400b6e3..37c999e86b4 100644
--- a/pkgs/development/python-modules/pivy/default.nix
+++ b/pkgs/development/python-modules/pivy/default.nix
@@ -16,8 +16,13 @@ buildPythonPackage rec {
     sha256 = "18n14ha2d3j3ghg2f2aqnf2mks94nn7ma9ii7vkiwcay93zm82cf";
   };
 
+  nativeBuildInputs = with pkgs; [
+    swig1 coin3d soqt
+  ];
+
   buildInputs = with pkgs; with xorg; [
-    swig1 coin3d soqt libGLU_combined
+    coin3d soqt
+    libGLU_combined
     libXi libXext libSM libICE libX11
   ];
 
diff --git a/pkgs/development/python-modules/pyside/tools.nix b/pkgs/development/python-modules/pyside/tools.nix
index abb0bdebd5d..e23e6352518 100644
--- a/pkgs/development/python-modules/pyside/tools.nix
+++ b/pkgs/development/python-modules/pyside/tools.nix
@@ -13,7 +13,11 @@ buildPythonPackage rec {
 
   enableParallelBuilding = true;
 
-  buildInputs = [ cmake pyside qt4 pysideShiboken ];
+  nativeBuildInputs = [ cmake ];
+
+  buildInputs = [ qt4 ];
+
+  propagatedBuildInputs = [ pyside pysideShiboken ];
 
   meta = {
     description = "Tools for pyside, the LGPL-licensed Python bindings for the Qt cross-platform application and UI framework";