From 80fa4c9a4152a338725c6bbd30f8f640adbe4d7b Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Thu, 5 Oct 2023 23:22:15 +0300
Subject: [PATCH] ams-lv2: fix py311 build

---
 pkgs/applications/audio/ams-lv2/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/applications/audio/ams-lv2/default.nix b/pkgs/applications/audio/ams-lv2/default.nix
index 88956a190c4a..3d3589de5485 100644
--- a/pkgs/applications/audio/ams-lv2/default.nix
+++ b/pkgs/applications/audio/ams-lv2/default.nix
@@ -15,6 +15,12 @@ stdenv.mkDerivation  rec {
   nativeBuildInputs = [ pkg-config wafHook python3 ];
   buildInputs = [ cairo fftw gtkmm2 lv2 lvtk ];
 
+  postPatch = ''
+    # U was removed in python 3.11 because it had no effect
+    substituteInPlace waflib/*.py \
+      --replace "m='rU" "m='r"
+  '';
+
   meta = with lib; {
     description = "An LV2 port of the internal modules found in Alsa Modular Synth";
     homepage = "https://github.com/blablack/ams-lv2";