diff --git a/3rdparty/cpprestsdk/src/pplx/pplxapple.cpp b/3rdparty/cpprestsdk/src/pplx/pplxapple.cpp
deleted file mode 100644
index 6e5ca6b3b41cb3eda18c2d05dcbc8672c3f6501b..0000000000000000000000000000000000000000
--- a/3rdparty/cpprestsdk/src/pplx/pplxapple.cpp
+++ /dev/null
@@ -1,64 +0,0 @@
-/***
- * ==++==
- *
- * Copyright (c) Microsoft Corporation. All rights reserved.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ==--==
- * =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
- *
- * Apple-specific pplx implementations
- *
- * =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
- ****/
-
-#include <errno.h>
-#include <sys/time.h>
-#include <pthread.h>
-#include <dispatch/dispatch.h>
-#include <libkern/OSAtomic.h>
-#include "stdafx.h"
-#include "pplx/pplx.h"
-
-// DEVNOTE:
-// The use of mutexes is suboptimal for synchronization of task execution.
-// Given that scheduler implementations should use GCD queues, there are potentially better mechanisms available to coordinate tasks (such as dispatch groups).
-
-namespace pplx
-{
-
-namespace details {
-
-    namespace platform
-    {
-        _PPLXIMP long GetCurrentThreadId()
-        {
-            pthread_t threadId = pthread_self();
-            return (long)threadId;
-        }
-
-        void YieldExecution()
-        {
-            sleep(0);
-        }
-
-    } // namespace platform
-
-    void apple_scheduler::schedule( TaskProc_t proc, void* param)
-    {
-        dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
-        dispatch_async_f(queue, param, proc);
-    }
-
-} // namespace details
-
-} // pplx