From ea6f9de7e04fe1e45121da6054a92d944c2034fa Mon Sep 17 00:00:00 2001
From: natsukium <tomoya.otabi@gmail.com>
Date: Wed, 5 Jul 2023 01:31:18 +0900
Subject: [PATCH] python310Packages.accupy: fix darwin build

---
 pkgs/development/python-modules/accupy/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/development/python-modules/accupy/default.nix b/pkgs/development/python-modules/accupy/default.nix
index dfe47d306811..7c6d33512bb7 100644
--- a/pkgs/development/python-modules/accupy/default.nix
+++ b/pkgs/development/python-modules/accupy/default.nix
@@ -1,4 +1,5 @@
 { lib
+, stdenv
 , buildPythonPackage
 , fetchFromGitHub
 , pythonOlder
@@ -56,6 +57,10 @@ buildPythonPackage rec {
     export HOME=$(mktemp -d)
   '';
 
+  # This variable is needed to suppress the "Trace/BPT trap: 5" error in Darwin's checkPhase.
+  # Not sure of the details, but we can avoid it by changing the matplotlib backend during testing.
+  env.MPLBACKEND = lib.optionalString stdenv.isDarwin "Agg";
+
   # performance tests aren't useful to us and disabling them allows us to
   # decouple ourselves from an unnecessary build dep
   preCheck = ''