From 1dda6c1752018ab83b9bad1b3c784efbb0fe9354 Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Mon, 31 Mar 2025 23:50:21 +0200
Subject: [PATCH 1/3] eigenpy: run unit tests

---
 pkgs/development/python-modules/eigenpy/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/python-modules/eigenpy/default.nix b/pkgs/development/python-modules/eigenpy/default.nix
index 2bbf0264e321..8797618041c4 100644
--- a/pkgs/development/python-modules/eigenpy/default.nix
+++ b/pkgs/development/python-modules/eigenpy/default.nix
@@ -31,6 +31,7 @@ buildPythonPackage rec {
 
   cmakeFlags = [
     "-DINSTALL_DOCUMENTATION=ON"
+    "-DBUILD_TESTING=ON"
     "-DBUILD_TESTING_SCIPY=ON"
   ];
 
@@ -50,6 +51,8 @@ buildPythonPackage rec {
     numpy
   ];
 
+  preInstallCheck = "make test";
+
   pythonImportsCheck = [ "eigenpy" ];
 
   meta = with lib; {

From 2a12441d01cadcdea6bf0f69653c2ef7ca2b576d Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Sun, 4 May 2025 11:59:31 +0200
Subject: [PATCH 2/3] python3Packages.eigenpy: add graphviz

---
 pkgs/development/python-modules/eigenpy/default.nix | 11 ++++++++++-
 pkgs/top-level/python-packages.nix                  |  4 +++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/python-modules/eigenpy/default.nix b/pkgs/development/python-modules/eigenpy/default.nix
index 8797618041c4..701d729e85d8 100644
--- a/pkgs/development/python-modules/eigenpy/default.nix
+++ b/pkgs/development/python-modules/eigenpy/default.nix
@@ -2,13 +2,21 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+
+  # nativeBuildInputs
   cmake,
   doxygen,
+  graphviz,
+  scipy,
+
+  # buildInputs
   boost,
+
+  # propagatedBuildInputs
   eigen,
   jrl-cmakemodules,
   numpy,
-  scipy,
+
 }:
 
 buildPythonPackage rec {
@@ -40,6 +48,7 @@ buildPythonPackage rec {
   nativeBuildInputs = [
     cmake
     doxygen
+    graphviz
     scipy
   ];
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index bfb8c27718d7..edc13191d773 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4375,7 +4375,9 @@ self: super: with self; {
 
   eheimdigital = callPackage ../development/python-modules/eheimdigital { };
 
-  eigenpy = callPackage ../development/python-modules/eigenpy { };
+  eigenpy = callPackage ../development/python-modules/eigenpy {
+    inherit (pkgs) graphviz; # need the `dot` program, not the python module
+  };
 
   einops = callPackage ../development/python-modules/einops { };
 

From d5072052afd83df4db1cf9d020853046631509b1 Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Sun, 4 May 2025 12:10:53 +0200
Subject: [PATCH 3/3] eigenpy: fix Fontconfig errors

---
 pkgs/development/python-modules/eigenpy/default.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/development/python-modules/eigenpy/default.nix b/pkgs/development/python-modules/eigenpy/default.nix
index 701d729e85d8..746e3a6a2d3e 100644
--- a/pkgs/development/python-modules/eigenpy/default.nix
+++ b/pkgs/development/python-modules/eigenpy/default.nix
@@ -3,6 +3,8 @@
   buildPythonPackage,
   fetchFromGitHub,
 
+  fontconfig,
+
   # nativeBuildInputs
   cmake,
   doxygen,
@@ -45,6 +47,12 @@ buildPythonPackage rec {
 
   strictDeps = true;
 
+  # Fontconfig error: No writable cache directories
+  preBuild = "export XDG_CACHE_HOME=$(mktemp -d)";
+
+  # Fontconfig error: Cannot load default config file: No such file: (null)
+  env.FONTCONFIG_FILE = "${fontconfig.out}/etc/fonts/fonts.conf";
+
   nativeBuildInputs = [
     cmake
     doxygen