From 3692a637e7e80a8df86e92b09df0c0b4795871ed Mon Sep 17 00:00:00 2001
From: Martin Joerg <martin.joerg@gmail.com>
Date: Fri, 28 Nov 2025 13:59:16 +0000
Subject: [PATCH] python3Packages.graph-tool: perform more import checks

---
 pkgs/development/python-modules/graph-tool/default.nix | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/python-modules/graph-tool/default.nix b/pkgs/development/python-modules/graph-tool/default.nix
index d3342642ebdc..cf4b067f31d8 100644
--- a/pkgs/development/python-modules/graph-tool/default.nix
+++ b/pkgs/development/python-modules/graph-tool/default.nix
@@ -9,6 +9,7 @@
   cairomm,
   cgal,
   expat,
+  fontconfig,
   gobject-introspection,
   gtk3,
   llvmPackages,
@@ -99,7 +100,14 @@ buildPythonPackage rec {
 
   propagatedNativeBuildInputs = [ gobject-introspection ];
 
-  pythonImportsCheck = [ "graph_tool" ];
+  preInstallCheck =
+    # avoid warnings about Matplotlib and Fontconfig configuration issues
+    ''
+      export HOME=$(mktemp -d)
+      export FONTCONFIG_FILE=${fontconfig.out}/etc/fonts/fonts.conf
+    '';
+
+  pythonImportsCheck = [ "graph_tool.all" ];
 
   passthru.updateScript = gitUpdater {
     url = "https://git.skewed.de/count0/graph-tool";