darwin.apple_sdk_11_0.libcompression: init at 11.0.0

pkgs/os-specific/darwin/apple-sdk-11.0/default.nix

···
     Libsystem = callPackage ./libSystem.nix { };
     LibsystemCross = pkgs.darwin.Libsystem;
     libcharset = callPackage ./libcharset.nix { };
+    libcompression = callPackage ./libcompression.nix { };
     libunwind = callPackage ./libunwind.nix { };
     libnetwork = callPackage ./libnetwork.nix { };
     libpm = callPackage ./libpm.nix { };

pkgs/os-specific/darwin/apple-sdk-11.0/libcompression.nix

···
+{ stdenvNoCC, buildPackages, MacOSX-SDK }:
+
+let self = stdenvNoCC.mkDerivation {
+  pname = "libcompression";
+  version = MacOSX-SDK.version;
+
+  dontUnpack = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/lib
+    cp ${MacOSX-SDK}/usr/lib/libcompression* $out/lib
+  '';
+
+  passthru = {
+    tbdRewrites = {
+      const."/usr/lib/libcompression.dylib" = "${self}/lib/libcompression.dylib";
+    };
+  };
+}; in self