From be8569be499490fc04eff48c2d27dd9d89aaa60d Mon Sep 17 00:00:00 2001
From: Ben Wolsieffer <benwolsieffer@gmail.com>
Date: Sat, 24 Nov 2018 18:09:52 -0500
Subject: [PATCH] pythonPackages.protobuf: fix compatibility with Python 3.7

---
 pkgs/development/python-modules/protobuf/default.nix | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/python-modules/protobuf/default.nix b/pkgs/development/python-modules/protobuf/default.nix
index 9059080c9196..a9d20983a55c 100644
--- a/pkgs/development/python-modules/protobuf/default.nix
+++ b/pkgs/development/python-modules/protobuf/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, python, buildPythonPackage
+{ stdenv, fetchpatch, python, buildPythonPackage
 , protobuf, google_apputils, pyext, libcxx
 , disabled, doCheck ? true }:
 
@@ -16,6 +16,15 @@ buildPythonPackage rec {
   propagatedBuildInputs = [ protobuf google_apputils ];
   buildInputs = [ google_apputils pyext ];
 
+  patches = [
+    # Python 3.7 compatibility (remove when protobuf 3.7 is released)
+    (fetchpatch {
+      url = "https://github.com/protocolbuffers/protobuf/commit/0a59054c30e4f0ba10f10acfc1d7f3814c63e1a7.patch";
+      sha256 = "09hw22y3423v8bbmc9xm07znwdxfbya6rp78d4zqw6fisdvjkqf1";
+      stripLen = 1;
+    })
+  ];
+
   prePatch = ''
     while [ ! -d python ]; do
       cd *