pugl: fix x86_64-darwin build

pkgs/by-name/pu/pugl/package.nix

@@ -15,6 +15,7 @@
   sphinx,
   sphinxygen,
   ninja,
+  apple-sdk_11,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -44,7 +45,8 @@ stdenv.mkDerivation (finalAttrs: {
     python3.pkgs.sphinx-lv2-theme
   ];
 
-  buildInputs = [
+  buildInputs =
+    [
       xorg.libX11
       xorg.libXcursor
       xorg.libXrandr
@@ -53,6 +55,9 @@ stdenv.mkDerivation (finalAttrs: {
       vulkan-headers
       xorg.libXext
       cairo
+    ]
+    ++ lib.optionals stdenv.hostPlatform.isDarwin [
+      apple-sdk_11
     ];
 
   meta = {