cups: fix build on darwin

pkgs/misc/cups/default.nix

@@ -1,6 +1,5 @@
 { lib, stdenv
 , fetchurl
-, fetchpatch
 , pkg-config
 , removeReferencesTo
 , zlib
@@ -41,6 +40,9 @@ stdenv.mkDerivation rec {
       # service would stop the socket and break subsequent socket activations.
       # See https://github.com/apple/cups/issues/6005
       sed -i '/PartOf=cups.service/d' scheduler/cups.socket.in
+  '' + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.targetPlatform.darwinSdkVersion "12") ''
+    substituteInPlace backend/usb-darwin.c \
+      --replace "kIOMainPortDefault" "kIOMasterPortDefault"
   '';
 
   nativeBuildInputs = [ pkg-config removeReferencesTo ];