diff --git a/pkgs/applications/graphics/gqview/default.nix b/pkgs/applications/graphics/gqview/default.nix
index e9edb7f0bd0..b507c67b5f5 100644
--- a/pkgs/applications/graphics/gqview/default.nix
+++ b/pkgs/applications/graphics/gqview/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, gtk, libpng}:
 
-assert !isNull pkgconfig && !isNull gtk && !isNull png;
+assert !isNull pkgconfig && !isNull gtk && !isNull libpng;
 # Note that we cannot just copy gtk's png attribute, since gtk might
 # not be linked against png.
 assert libpng == gtk.libpng;
diff --git a/pkgs/development/libraries/gnome/GConf/default.nix b/pkgs/development/libraries/gnome/GConf/default.nix
index 59a7fc6139b..0c6f0dfe010 100644
--- a/pkgs/development/libraries/gnome/GConf/default.nix
+++ b/pkgs/development/libraries/gnome/GConf/default.nix
@@ -2,7 +2,7 @@
 
 assert !isNull pkgconfig && !isNull perl
   && !isNull glib && !isNull gtk
-  && !isNull libxml2 && !isNull ORBit && !isNull popt;
+  && !isNull libxml2 && !isNull ORBit2 && !isNull popt;
 
 derivation {
   name = "GConf-2.4.0.1";
diff --git a/pkgs/development/libraries/gnome/libIDL/default.nix b/pkgs/development/libraries/gnome/libIDL/default.nix
index 79ef17dd6b8..a7df8988350 100644
--- a/pkgs/development/libraries/gnome/libIDL/default.nix
+++ b/pkgs/development/libraries/gnome/libIDL/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, glib, lex, yacc}:
 
-assert !isNull pkgconfig && !isNull gtk && !isNull lex && !isNull yacc;
+assert !isNull pkgconfig && !isNull glib && !isNull lex && !isNull yacc;
 
 derivation {
   name = "libIDL-0.8.2";