From 4a7c9e5af23ca8c0116c73ff89583f7be8e01dcf Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Fri, 4 Jan 2019 14:22:03 +0100
Subject: [PATCH] python36.pkgs.rsa: fix build

---
 pkgs/development/python-modules/rsa/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/python-modules/rsa/default.nix b/pkgs/development/python-modules/rsa/default.nix
index c062aad4c4be..1b3d339b0785 100644
--- a/pkgs/development/python-modules/rsa/default.nix
+++ b/pkgs/development/python-modules/rsa/default.nix
@@ -4,6 +4,8 @@
 , unittest2
 , pyasn1
 , mock
+, isPy3k
+, pythonOlder
 }:
 
 buildPythonPackage rec {
@@ -18,6 +20,10 @@ buildPythonPackage rec {
   checkInputs = [ unittest2 mock ];
   propagatedBuildInputs = [ pyasn1 ];
 
+  preConfigure = stdenv.lib.optionalString (isPy3k && pythonOlder "3.7") ''
+    substituteInPlace setup.py --replace "open('README.md')" "open('README.md',encoding='utf-8')"
+  '';
+
   meta = with stdenv.lib; {
     homepage = https://stuvel.eu/rsa;
     license = licenses.asl20;