From c214e8a812e8ea8dfebdf7006b8cdd7b0796c1e4 Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Sun, 14 Jun 2026 06:42:55 -0400
Subject: [PATCH] ffmpeg-headless: disable cuda-llvm support on Darwin
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After https://github.com/NixOS/nixpkgs/pull/518519, Clang is unwrapped
when cuda-llvm support is enabled when building ffmpeg. This causes
ffmpeg-headless to fail to build on Darwin because its `configure`
script cannot find dependencies due to using an unwrapped compiler.
Since Cuda isn’t supported on Darwin anyway, disabling cuda-llvm has the
effect of using a wrapped Clang on Darwin again.
---
 pkgs/development/libraries/ffmpeg/generic.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/ffmpeg/generic.nix b/pkgs/development/libraries/ffmpeg/generic.nix
index a366393f6f79..dbf12cd3e722 100644
--- a/pkgs/development/libraries/ffmpeg/generic.nix
+++ b/pkgs/development/libraries/ffmpeg/generic.nix
@@ -59,7 +59,7 @@
   withChromaprint ? withFullDeps, # Audio fingerprinting
   withCodec2 ? withFullDeps, # codec2 en/decoding
   withCuda ? withFullDeps && withNvcodec,
-  withCudaLLVM ? withHeadlessDeps,
+  withCudaLLVM ? withHeadlessDeps && !stdenv.hostPlatform.isDarwin, # Cuda isn’t supported on Darwin
   withCudaNVCC ? withFullDeps && withUnfree && config.cudaSupport,
   withCuvid ? withHeadlessDeps && withNvcodec,
   withDav1d ? withHeadlessDeps, # AV1 decoder (focused on speed and correctness)