From cb196f490eb77bf6732ae8bf1ffaaa5abe26d191 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Fri, 30 Mar 2018 17:59:34 +0200
Subject: [PATCH] dhcpcd: fix /bin/sh impurity

The usual error during configuration:
syntax error: you disabled math support for $((arith)) syntax
---
 pkgs/tools/networking/dhcpcd/default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/tools/networking/dhcpcd/default.nix b/pkgs/tools/networking/dhcpcd/default.nix
index 02d5a3073f4..93529fe4ce5 100644
--- a/pkgs/tools/networking/dhcpcd/default.nix
+++ b/pkgs/tools/networking/dhcpcd/default.nix
@@ -13,6 +13,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ udev ];
 
+  preConfigure = "patchShebangs ./configure";
+
   configureFlags = [
     "--sysconfdir=/etc"
     "--localstatedir=/var"