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-rw-r--r--pkgs/development/libraries/gtk+/pango/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/gtk+/pango/default.nix b/pkgs/development/libraries/gtk+/pango/default.nix
index d598d97f9c37..36731123e56f 100644
--- a/pkgs/development/libraries/gtk+/pango/default.nix
+++ b/pkgs/development/libraries/gtk+/pango/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, x11, glib, xft}:
 
-assert !isNull pkgconfig && !isNull x11 && !isNull glib && !isNull xft;
+assert pkgconfig != null && x11 != null && glib != null && xft != null;
 assert x11.buildClientLibs;
 assert xft.x11 == x11;