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-rw-r--r--pkgs/development/libraries/xft/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/xft/default.nix b/pkgs/development/libraries/xft/default.nix
index 0764a1dd80ad..ea1cef2cfe6d 100644
--- a/pkgs/development/libraries/xft/default.nix
+++ b/pkgs/development/libraries/xft/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, x11, fontconfig}:
 
-assert !isNull pkgconfig && !isNull x11 && !isNull fontconfig;
+assert pkgconfig != null && x11 != null && fontconfig != null;
 assert fontconfig.x11 == x11;
 
 derivation {