xcbuild: cleanup

pkgs/development/tools/xcbuild/sdks.nix

@@ -1,4 +1,5 @@
-{ runCommand, lib, toolchainName, sdkName, writeText, version, xcodePlatform }:
+{ stdenv, runCommand, lib, toolchainName, sdkName
+, writeText, version, xcodePlatform, libcxx, symlinkJoin }:
 
 let
   inherit (lib.generators) toPlist;
@@ -18,11 +19,11 @@ let
   };
 in
 
-runCommand "SDKs" {
-  inherit version;
-} ''
+runCommand "SDKs" {} ''
   sdk=$out/${sdkName}.sdk
   install -D ${writeText "SDKSettings.plist" (toPlist {} SDKSettings)} $sdk/SDKSettings.plist
   install -D ${writeText "SystemVersion.plist" (toPlist {} SystemVersion)} $sdk/System/Library/CoreServices/SystemVersion.plist
+  ln -s $sdk $sdk/usr
+
   ln -s $sdk $out/${xcodePlatform}.sdk
 ''