wine: fix build failure on Darwin

pkgs/applications/emulators/wine/base.nix

@@ -108,9 +108,13 @@ stdenv.mkDerivation ((lib.optionalAttrs (buildScript != null) {
   ])));
 
   patches = [ ]
-    # Wine requires `MTLDevice.registryID` for `winemac.drv`, but that property is not available
-    # in the 10.12 SDK (current SDK on x86_64-darwin). Work around that by using selector syntax.
-    ++ lib.optional stdenv.isDarwin ./darwin-metal-compat.patch
+    ++ lib.optionals stdenv.isDarwin [
+      # Wine requires `MTLDevice.registryID` for `winemac.drv`, but that property is not available
+      # in the 10.12 SDK (current SDK on x86_64-darwin). Work around that by using selector syntax.
+      ./darwin-metal-compat.patch
+      # Wine requires `qos.h`, which is not included by default on the 10.12 SDK in nixpkgs.
+      ./darwin-qos.patch
+    ]
     ++ patches';
 
   configureFlags = prevConfigFlags

pkgs/applications/emulators/wine/darwin-qos.patch

@@ -0,0 +1,12 @@
+diff --git a/dlls/ntdll/unix/loader.c b/dlls/ntdll/unix/loader.c
+index cde37c48b0d..be237bc0ad3 100644
+--- a/dlls/ntdll/unix/loader.c
++++ b/dlls/ntdll/unix/loader.c
+@@ -65,6 +65,7 @@
+ # undef LoadResource
+ # undef GetCurrentThread
+ # include <pthread.h>
++# include <pthread/qos.h>
+ # include <mach/mach.h>
+ # include <mach/mach_error.h>
+ # include <mach-o/getsect.h>