From 26ae310f9d5a4dec03200d8b2e1e9946a807b5d7 Mon Sep 17 00:00:00 2001
From: OPNA2608 <opna2608@protonmail.com>
Date: Thu, 20 Nov 2025 15:56:49 +0100
Subject: [PATCH] sdl3: Disable AltiVec optimisations on non-ppc64le

Baselines for 32-bit and big-endian 64-bit POWER don't guarantee it.
---
 pkgs/by-name/sd/sdl3/package.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/by-name/sd/sdl3/package.nix b/pkgs/by-name/sd/sdl3/package.nix
index 0e5feb85776a..f542994bebd5 100644
--- a/pkgs/by-name/sd/sdl3/package.nix
+++ b/pkgs/by-name/sd/sdl3/package.nix
@@ -171,6 +171,9 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.cmakeBool "SDL_TESTS" true)
     (lib.cmakeBool "SDL_INSTALL_TESTS" true)
     (lib.cmakeBool "SDL_DEPS_SHARED" false)
+
+    # Only ppc64le baseline guarantees AltiVec
+    (lib.cmakeBool "SDL_ALTIVEC" (stdenv.hostPlatform.isPower64 && stdenv.hostPlatform.isLittleEndian))
   ]
   ++
     lib.optionals