From 9e5774c4e319c570335c26ca1013fdba3252f5a0 Mon Sep 17 00:00:00 2001
From: Reno Dakota <paparodeo@proton.me>
Date: Sun, 1 Dec 2024 14:14:44 -0800
Subject: [PATCH] python312Packages.hvplot: fix checks on darwin

fix checkphase on darwin to not access the display
---
 pkgs/development/python-modules/hvplot/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/python-modules/hvplot/default.nix b/pkgs/development/python-modules/hvplot/default.nix
index 4831f14335c0..0687b65e297f 100644
--- a/pkgs/development/python-modules/hvplot/default.nix
+++ b/pkgs/development/python-modules/hvplot/default.nix
@@ -69,6 +69,12 @@ buildPythonPackage rec {
     "hvplot/tests/testutil.py"
   ];
 
+  # need to set MPLBACKEND=agg for headless matplotlib for darwin
+  # https://github.com/matplotlib/matplotlib/issues/26292
+  preCheck = ''
+    export MPLBACKEND=agg
+  '';
+
   pythonImportsCheck = [ "hvplot.pandas" ];
 
   meta = {