From 2c574b9c4c6f97074c24d4019cf1279a5613134b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20Sch=C3=BCtz?= <nix@dotlambda.de>
Date: Fri, 10 Oct 2025 20:21:34 -0700
Subject: [PATCH 1/2] python311Packages.tkinter: mark broken

It fails to build with

    fatal error: tommath.h: No such file or directory
---
 pkgs/development/python-modules/tkinter/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/python-modules/tkinter/default.nix b/pkgs/development/python-modules/tkinter/default.nix
index afc6d765a498..7933c994356a 100644
--- a/pkgs/development/python-modules/tkinter/default.nix
+++ b/pkgs/development/python-modules/tkinter/default.nix
@@ -86,6 +86,7 @@ buildPythonPackage {
   pythonImportsCheck = [ "tkinter" ];
 
   meta = {
+    broken = pythonOlder "3.12"; # tommath.h: No such file or directory
     # Based on first sentence from https://docs.python.org/3/library/tkinter.html
     description = "Standard Python interface to the Tcl/Tk GUI toolkit";
     longDescription = ''

From 22412a6ab0448c78663d60277cc0a47a3f1987f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20Sch=C3=BCtz?= <nix@dotlambda.de>
Date: Fri, 10 Oct 2025 20:31:00 -0700
Subject: [PATCH 2/2] python311Packages.matplotlib: disable Tk on Python 3.11

The tkinter package fails to build on Python 3.11.
---
 pkgs/development/python-modules/matplotlib/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/python-modules/matplotlib/default.nix b/pkgs/development/python-modules/matplotlib/default.nix
index 4c23466b9880..926dd2467971 100644
--- a/pkgs/development/python-modules/matplotlib/default.nix
+++ b/pkgs/development/python-modules/matplotlib/default.nix
@@ -4,6 +4,7 @@
   fetchPypi,
   buildPythonPackage,
   isPyPy,
+  pythonAtLeast,
   pythonOlder,
 
   # build-system
@@ -52,7 +53,8 @@
 
   # Tk
   # Darwin has its own "MacOSX" backend, PyPy has tkagg backend and does not support tkinter
-  enableTk ? (!stdenv.hostPlatform.isDarwin && !isPyPy),
+  # tkinter fails to build on Python 3.11
+  enableTk ? (!stdenv.hostPlatform.isDarwin && !isPyPy && pythonAtLeast "3.12"),
   tkinter,
 
   # Qt