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diff --git a/src/third_party/boost-1.69.0/boost/config/platform/cygwin.hpp b/src/third_party/boost-1.69.0/boost/config/platform/cygwin.hpp
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+++ b/src/third_party/boost-1.69.0/boost/config/platform/cygwin.hpp
@@ -0,0 +1,68 @@
+//  (C) Copyright John Maddock 2001 - 2003. 
+//  Use, modification and distribution are subject to the 
+//  Boost Software License, Version 1.0. (See accompanying file 
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org for most recent version.
+
+//  cygwin specific config options:
+
+#define BOOST_PLATFORM "Cygwin"
+#define BOOST_HAS_DIRENT_H
+#define BOOST_HAS_LOG1P
+#define BOOST_HAS_EXPM1
+
+//
+// Threading API:
+// See if we have POSIX threads, if we do use them, otherwise
+// revert to native Win threads.
+#define BOOST_HAS_UNISTD_H
+#include <unistd.h>
+#if defined(_POSIX_THREADS) && (_POSIX_THREADS+0 >= 0) && !defined(BOOST_HAS_WINTHREADS)
+#  define BOOST_HAS_PTHREADS
+#  define BOOST_HAS_SCHED_YIELD
+#  define BOOST_HAS_GETTIMEOFDAY
+#  define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
+//#  define BOOST_HAS_SIGACTION
+#else
+#  if !defined(BOOST_HAS_WINTHREADS)
+#     define BOOST_HAS_WINTHREADS
+#  endif
+#  define BOOST_HAS_FTIME
+#endif
+
+//
+// find out if we have a stdint.h, there should be a better way to do this:
+//
+#include <sys/types.h>
+#ifdef _STDINT_H
+#define BOOST_HAS_STDINT_H
+#endif
+#if __GNUC__ > 5 && !defined(BOOST_HAS_STDINT_H)
+#   define BOOST_HAS_STDINT_H
+#endif
+
+/// Cygwin has no fenv.h
+#define BOOST_NO_FENV_H
+
+// Cygwin has it's own <pthread.h> which breaks <shared_mutex> unless the correct compiler flags are used:
+#ifndef BOOST_NO_CXX14_HDR_SHARED_MUTEX
+#include <pthread.h>
+#if !(__XSI_VISIBLE >= 500 || __POSIX_VISIBLE >= 200112)
+#  define BOOST_NO_CXX14_HDR_SHARED_MUTEX
+#endif
+#endif
+
+// boilerplate code:
+#include <boost/config/detail/posix_features.hpp>
+
+//
+// Cygwin lies about XSI conformance, there is no nl_types.h:
+//
+#ifdef BOOST_HAS_NL_TYPES_H
+#  undef BOOST_HAS_NL_TYPES_H
+#endif
+
+
+
+