From 2fbde72556c981b5005e2dbe8599b5d3adb5c13f Mon Sep 17 00:00:00 2001
From: Timo Kaufmann <timokau@zoho.com>
Date: Sun, 25 Nov 2018 17:38:45 +0100
Subject: [PATCH] sage: add tkinter as matplotlib backend (#51032)

Fixes #50959.
---
 pkgs/applications/science/math/sage/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/applications/science/math/sage/default.nix b/pkgs/applications/science/math/sage/default.nix
index 6403b649af4..832b2f11056 100644
--- a/pkgs/applications/science/math/sage/default.nix
+++ b/pkgs/applications/science/math/sage/default.nix
@@ -110,6 +110,7 @@ let
     sympy
     fpylll
     matplotlib
+    tkinter # optional, as a matplotlib backend (use with `%matplotlib tk`)
     scipy
     ipywidgets
     rpy2