diff --git a/pkgs/development/libraries/gtk+/2.16.x.nix b/pkgs/development/libraries/gtk+/2.16.x.nix
index 9abbd3aa49d..2c81ecc84e0 100644
--- a/pkgs/development/libraries/gtk+/2.16.x.nix
+++ b/pkgs/development/libraries/gtk+/2.16.x.nix
@@ -18,8 +18,6 @@ stdenv.mkDerivation rec {
     x11 glib atk pango libtiff libjpeg libpng cairo xlibs.libXrandr
   ] ++ stdenv.lib.optional xineramaSupport xlibs.libXinerama;
     
-  passthru = { inherit libtiff libjpeg libpng; };
-
   meta = {
     description = "A multi-platform toolkit for creating graphical user interfaces";
 
diff --git a/pkgs/development/libraries/gtk+/2.24.x.nix b/pkgs/development/libraries/gtk+/2.24.x.nix
index e4a1f0969f9..926187f7374 100644
--- a/pkgs/development/libraries/gtk+/2.24.x.nix
+++ b/pkgs/development/libraries/gtk+/2.24.x.nix
@@ -37,8 +37,6 @@ stdenv.mkDerivation rec {
 
   postInstall = "rm -rf $out/share/gtk-doc";
   
-  passthru = { inherit libtiff libjpeg libpng; };
-
   meta = {
     description = "A multi-platform toolkit for creating graphical user interfaces";
 
diff --git a/pkgs/development/libraries/wxGTK-2.6/default.nix b/pkgs/development/libraries/wxGTK-2.6/default.nix
index 1496682f5e3..710400ab094 100644
--- a/pkgs/development/libraries/wxGTK-2.6/default.nix
+++ b/pkgs/development/libraries/wxGTK-2.6/default.nix
@@ -2,12 +2,6 @@
 , compat22 ? false, compat24 ? true, unicode ? true
 }:
 
-assert pkgconfig != null && gtk != null;
-assert gtk.libtiff != null;
-assert gtk.libjpeg != null;
-assert gtk.libpng != null;
-assert gtk.libpng.zlib != null;
-
 stdenv.mkDerivation {
   name = "wxGTK-2.6.4";
 
@@ -16,10 +10,9 @@ stdenv.mkDerivation {
     sha256 = "1yilzg9qxvdpqhhd3sby1w9pj00k7jqw0ikmwyhh5jmaqnnnrb2x";
   };
 
-  buildInputs = [
-    pkgconfig gtk gtk.libtiff gtk.libjpeg gtk.libpng gtk.libpng.zlib
-    libXinerama libSM libXxf86vm xf86vidmodeproto
-  ];
+  buildInputs = [ gtk libXinerama libSM libXxf86vm xf86vidmodeproto ];
+
+  buildNativeInputs = [ pkgconfig ];
 
   configureFlags = [
     "--enable-gtk2"
diff --git a/pkgs/development/libraries/wxGTK-2.8/default.nix b/pkgs/development/libraries/wxGTK-2.8/default.nix
index 1cfa57b24d2..0bfe4c2335c 100644
--- a/pkgs/development/libraries/wxGTK-2.8/default.nix
+++ b/pkgs/development/libraries/wxGTK-2.8/default.nix
@@ -2,12 +2,6 @@
 , mesa, compat24 ? false, compat26 ? true, unicode ? true,
 }:
 
-assert pkgconfig != null && gtk != null;
-assert gtk.libtiff != null;
-assert gtk.libjpeg != null;
-assert gtk.libpng != null;
-assert gtk.libpng.zlib != null;
-
 stdenv.mkDerivation {
   name = "wxGTK-2.8.12";
 
@@ -16,10 +10,9 @@ stdenv.mkDerivation {
     sha256 = "1gjs9vfga60mk4j4ngiwsk9h6c7j22pw26m3asxr1jwvqbr8kkqk";
   };
 
-  buildInputs = [
-    pkgconfig gtk gtk.libtiff gtk.libjpeg gtk.libpng gtk.libpng.zlib
-    libXinerama libSM libXxf86vm xf86vidmodeproto mesa
-  ];
+  buildInputs = [ gtk libXinerama libSM libXxf86vm xf86vidmodeproto mesa ];
+
+  buildNativeInputs = [ pkgconfig ];
 
   configureFlags = [
     "--enable-gtk2"
diff --git a/pkgs/development/libraries/wxGTK-2.9/2.9.0.nix b/pkgs/development/libraries/wxGTK-2.9/2.9.0.nix
index 433f7fe2187..0520adef4dc 100644
--- a/pkgs/development/libraries/wxGTK-2.9/2.9.0.nix
+++ b/pkgs/development/libraries/wxGTK-2.9/2.9.0.nix
@@ -2,12 +2,6 @@
 , mesa, compat24 ? false, compat26 ? true, unicode ? true,
 }:
 
-assert pkgconfig != null && gtk != null;
-assert gtk.libtiff != null;
-assert gtk.libjpeg != null;
-assert gtk.libpng != null;
-assert gtk.libpng.zlib != null;
-
 stdenv.mkDerivation {
   name = "wxwidgets-2.9.0";
 
@@ -16,10 +10,9 @@ stdenv.mkDerivation {
     sha256 = "10n75mpypd9411b29gxmi0g2s7dgbfwkgiyhxwkjsyrmyvfc3xcc";
   };
 
-  buildInputs = [
-    pkgconfig gtk gtk.libtiff gtk.libjpeg gtk.libpng gtk.libpng.zlib
-    libXinerama libSM libXxf86vm xf86vidmodeproto mesa
-  ];
+  buildInputs = [ gtk libXinerama libSM libXxf86vm xf86vidmodeproto mesa ];
+
+  buildNativeInputs = [ pkgconfig ];
 
   configureFlags = [
     "--enable-gtk2"
diff --git a/pkgs/development/libraries/wxGTK-2.9/default.nix b/pkgs/development/libraries/wxGTK-2.9/default.nix
index 8385a52db19..2f83d3cc03f 100644
--- a/pkgs/development/libraries/wxGTK-2.9/default.nix
+++ b/pkgs/development/libraries/wxGTK-2.9/default.nix
@@ -2,12 +2,6 @@
 , mesa, compat24 ? false, compat26 ? true, unicode ? true,
 }:
 
-assert pkgconfig != null && gtk != null;
-assert gtk.libtiff != null;
-assert gtk.libjpeg != null;
-assert gtk.libpng != null;
-assert gtk.libpng.zlib != null;
-
 stdenv.mkDerivation {
   name = "wxwidgets-2.9.1";
 
@@ -16,10 +10,9 @@ stdenv.mkDerivation {
     sha256 = "1f6pdlzjawhhs17hmimk0l1n3g4g48n2iqrgl181xqfrbxyz75b8";
   };
 
-  buildInputs = [
-    pkgconfig gtk gtk.libtiff gtk.libjpeg gtk.libpng gtk.libpng.zlib
-    libXinerama libSM libXxf86vm xf86vidmodeproto mesa
-  ];
+  buildInputs = [ gtk libXinerama libSM libXxf86vm xf86vidmodeproto mesa ];
+
+  buildNativeInputs = [ pkgconfig ];
 
   configureFlags = [
     "--enable-gtk2"