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-rw-r--r--pkgs/servers/x11/xfree86/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/servers/x11/xfree86/default.nix b/pkgs/servers/x11/xfree86/default.nix
index 17971c2081fd..1de8e2b9a117 100644
--- a/pkgs/servers/x11/xfree86/default.nix
+++ b/pkgs/servers/x11/xfree86/default.nix
@@ -4,7 +4,7 @@
 
 assert !buildServer; # we don't support this currently
 assert buildClientLibs; # we don't support *not* doing this currently
-assert !isNull bison && !isNull flex;
+assert bison != null && flex != null;
 
 derivation {
   name = "xfree86-4.3";