From bb1e00dcb57cdc0e6fc7100f57acc38539bb0ed9 Mon Sep 17 00:00:00 2001
From: Dan Peebles <pumpkin@me.com>
Date: Tue, 19 Jul 2016 07:57:42 -0400
Subject: [PATCH] pythonPackages.cffi: remove unnecessary compiler flag

I thought this was necessary but it doesn't appear to be after all
---
 pkgs/top-level/python-packages.nix | 2 --
 1 file changed, 2 deletions(-)

diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index fa7d649ed3f..0887cf084c7 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4379,8 +4379,6 @@ in modules // {
       substituteInPlace testing/cffi0/test_ownlib.py --replace "gcc" "cc"
     '';
 
-    NIX_CFLAGS_COMPILE="-Wno-shift-negative-value";
-
     checkPhase = ''
       py.test
     '';