From d630be51ab617356ca9817f935636ac48dd5b745 Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Fri, 5 Jan 2018 19:27:02 -0600
Subject: [PATCH] tcpdump: fix eval if no kernelMajor specified, assume compat

---
 pkgs/tools/networking/tcpdump/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/tools/networking/tcpdump/default.nix b/pkgs/tools/networking/tcpdump/default.nix
index 8dba4b373a3..5c6920487b7 100644
--- a/pkgs/tools/networking/tcpdump/default.nix
+++ b/pkgs/tools/networking/tcpdump/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   crossAttrs = {
     LDFLAGS = if enableStatic then "-static" else "";
     configureFlags = [ "ac_cv_linux_vers=2" ] ++ (stdenv.lib.optional
-      (hostPlatform.platform.kernelMajor == "2.4") "--disable-ipv6");
+      (hostPlatform.platform.kernelMajor or null == "2.4") "--disable-ipv6");
   };
 
   meta = {