From f1a4e82a1aaf39133959b57a78c010084f5b3e7d Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Sun, 7 Jun 2020 10:39:08 +0200
Subject: [PATCH] python.pkgs.wcwidth: fix build

---
 .../python-modules/wcwidth/default.nix            | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/pkgs/development/python-modules/wcwidth/default.nix b/pkgs/development/python-modules/wcwidth/default.nix
index b51e13df2e8..b93ca1dbb4d 100644
--- a/pkgs/development/python-modules/wcwidth/default.nix
+++ b/pkgs/development/python-modules/wcwidth/default.nix
@@ -1,4 +1,7 @@
-{ lib, fetchPypi, buildPythonPackage, pytest }:
+{ lib, fetchPypi, buildPythonPackage, pytestCheckHook
+, isPy3k
+, backports_functools_lru_cache
+}:
 
 buildPythonPackage rec {
   pname = "wcwidth";
@@ -9,15 +12,15 @@ buildPythonPackage rec {
     sha256 = "edbc2b718b4db6cdf393eefe3a420183947d6aa312505ce6754516f458ff8830";
   };
 
-  checkInputs = [ pytest ];
+  checkInputs = [ pytestCheckHook ];
+
+  propagatedBuildInputs = lib.optionals (!isPy3k) [
+    backports_functools_lru_cache
+  ];
 
   # To prevent infinite recursion with pytest
   doCheck = false;
 
-  checkPhase = ''
-    pytest
-  '';
-
   meta = with lib; {
     description = "Measures number of Terminal column cells of wide-character codes";
     longDescription = ''