darwin.apple_sdk_10_12.frameworks.System: init

pkgs/os-specific/darwin/apple-sdk/default.nix

···
       '';
     });
 
+    System = lib.overrideDerivation super.System (drv: {
+      installPhase = ''
+        mkdir -p $out/Library/Frameworks/System.framework/Versions/B
+        ln -s $out/Library/Frameworks/System.framework/Versions/{B,Current}
+        ln -s ${pkgs.darwin.Libsystem}/lib/libSystem.B.tbd $out/Library/Frameworks/System.framework/Versions/B/System.tbd
+        ln -s $out/Library/Frameworks/System.framework/{Versions/Current/,}System.tbd
+      '';
+    });
+
     WebKit = lib.overrideDerivation super.WebKit (drv: {
       extraTBDFiles = [
         "Versions/A/Frameworks/WebCore.framework/Versions/A/WebCore.tbd"

pkgs/os-specific/darwin/apple-sdk/frameworks.nix

···
   SpriteKit               = {};
   StoreKit                = {};
   SyncServices            = {};
+  System                  = {};
   SystemConfiguration     = { inherit Security; };
   TWAIN                   = { inherit Carbon; };
   Tcl                     = {};