From 6d4b7d3af17677812bee1869bae370f1fd7c1775 Mon Sep 17 00:00:00 2001
From: Wout Mertens <Wout.Mertens@gmail.com>
Date: Tue, 28 Oct 2014 22:29:05 +0100
Subject: [PATCH] libpcap: Force detection on Darwin

---
 pkgs/development/libraries/libpcap/default.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/libpcap/default.nix b/pkgs/development/libraries/libpcap/default.nix
index c6f1f1a1ddc..9ed1aab4034 100644
--- a/pkgs/development/libraries/libpcap/default.nix
+++ b/pkgs/development/libraries/libpcap/default.nix
@@ -10,7 +10,12 @@ stdenv.mkDerivation rec {
   
   nativeBuildInputs = [ flex bison ];
   
-  configureFlags = stdenv.lib.optionals stdenv.isLinux "--with-pcap=linux";
+  # We need to force the autodetection because detection doesn't
+  # work in pure build enviroments.
+  configureFlags =
+    if stdenv.isLinux then [ "--with-pcap=linux" ]
+    else if stdenv.isDarwin then [ "--with-pcap=bpf" ]
+    else [];
 
   preInstall = ''mkdir -p $out/bin'';