From 3b90055f2cd5a20d1f4ff2b4d1581795a4eef645 Mon Sep 17 00:00:00 2001
From: Ken Payson <kpayson@google.com>
Date: Mon, 10 Apr 2017 15:53:17 -0700
Subject: [PATCH] Fix mac build

---
 src/python/grpcio/commands.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/python/grpcio/commands.py b/src/python/grpcio/commands.py
index e50ccbe23e7..f196b028a76 100644
--- a/src/python/grpcio/commands.py
+++ b/src/python/grpcio/commands.py
@@ -260,7 +260,7 @@ class BuildExt(build_ext.build_ext):
     """Custom build_ext command to enable compiler-specific flags."""
 
     C_OPTIONS = {
-        'unix': ('-pthread', '-std=gnu99'),
+        'unix': ('-pthread',),
         'msvc': (),
     }
     LINK_OPTIONS = {}