anchor.diff:  
     CoreSymbolication = callPackage ../os-specific/darwin/CoreSymbolication { };
   
  -  CF = callPackage ../os-specific/darwin/swift-corelibs/corefoundation.nix { };
  +  # TODO: make swift-corefoundation build with apple_sdk_11_0.Libsystem
  +  CF = if useAppleSDKLibs
  +    then apple_sdk.frameworks.CoreFoundation
  +    else callPackage ../os-specific/darwin/swift-corelibs/corefoundation.nix { };
   
     # As the name says, this is broken, but I don't want to lose it since it's a direction we want to go in
     # libdispatch-broken = callPackage ../os-specific/darwin/swift-corelibs/libdispatch.nix { };
  
positive.code: 
    iproute2mac = callPackage ../os-specific/darwin/iproute2mac { };
  
    libobjc = apple-source-releases.objc4;
  
    lsusb = callPackage ../os-specific/darwin/lsusb { };
  
  
negative.code: 
    binutils-unwrapped = callPackage ../os-specific/darwin/binutils {
      inherit (pkgs) binutils-unwrapped;
      inherit (pkgs.llvmPackages) llvm clang-unwrapped;
    };
  
    binutils = pkgs.wrapBintoolsWith {
  