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-rw-r--r--pkgs/development/libraries/gnome/libbonobo/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/libraries/gnome/libbonobo/default.nix b/pkgs/development/libraries/gnome/libbonobo/default.nix
index 9e50e61ac848..c2a6adb9ecef 100644
--- a/pkgs/development/libraries/gnome/libbonobo/default.nix
+++ b/pkgs/development/libraries/gnome/libbonobo/default.nix
@@ -1,7 +1,7 @@
 {stdenv, fetchurl, pkgconfig, perl, ORBit2, libxml2, popt, yacc, flex}:
 
-assert !isNull pkgconfig && !isNull perl && !isNull ORBit2
-  && !isNull libxml2 && !isNull popt && !isNull yacc && !isNull flex;
+assert pkgconfig != null && perl != null && ORBit2 != null
+  && libxml2 != null && popt != null && yacc != null && flex != null;
 
 derivation {
   name = "libbonobo-2.4.2";