From 0cdad561e59ffd4ea98ea62249311a624b054108 Mon Sep 17 00:00:00 2001
From: Matt Wittmann <mwittmann@relaytx.com>
Date: Mon, 25 Apr 2022 15:12:22 -0700
Subject: [PATCH] Use composeExtensions to preserve existing Python package
 overrides

---
 overlay.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/overlay.nix b/overlay.nix
index 90c2a9ef..b115bb50 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -281,8 +281,13 @@ let
         xtb = callPackage ./pkgs/apps/xtb { };
 
         ### Python packages
-        python3 = super.python3.override { packageOverrides = pythonOverrides cfg self super; };
-        python2 = super.python2.override { packageOverrides = pythonOverrides cfg self super; };
+        python3 = super.python3.override (old: {
+          packageOverrides = super.lib.composeExtensions (old.packageOverrides or (_: _: { })) (pythonOverrides cfg self super);
+        });
+
+        python2 = super.python2.override (old: {
+          packageOverrides = super.lib.composeExtensions (old.packageOverrides or (_: _: { })) (pythonOverrides cfg self super);
+        });
 
         #
         # Libraries