--- boost_1_75_0/boost/log/detail/config.hpp.orig	2021-04-05 16:25:32.003076500 +0200
+++ boost_1_75_0/boost/log/detail/config.hpp	2021-04-05 16:26:08.365696000 +0200
@@ -17,12 +17,6 @@
 #ifndef BOOST_LOG_DETAIL_CONFIG_HPP_INCLUDED_
 #define BOOST_LOG_DETAIL_CONFIG_HPP_INCLUDED_
 
-// This check must be before any system headers are included, or __MSVCRT_VERSION__ may get defined to 0x0600
-#if defined(__MINGW32__) && !defined(__MSVCRT_VERSION__)
-// Target MinGW headers to at least MSVC 7.0 runtime by default. This will enable some useful functions.
-#define __MSVCRT_VERSION__ 0x0700
-#endif
-
 #include <boost/predef/os.h>
 
 // Try including WinAPI config as soon as possible so that any other headers don't include Windows SDK headers
--- boost_1_75_0/boost/nowide/config.hpp.orig	2021-04-05 16:25:38.162569500 +0200
+++ boost_1_75_0/boost/nowide/config.hpp	2021-04-05 16:26:11.891185000 +0200
@@ -17,13 +17,6 @@
 
 //! @cond Doxygen_Suppress
 
-// MinGW32 requires a __MSVCRT_VERSION__ defined to make some functions available, e.g. _stat64
-// Hence define this here to target MSVC 7.0 which has the required functions and do it as early as possible
-// as including a system header might default this to 0x0600 which is to low
-#if defined(__MINGW32__) && !defined(__MSVCRT_VERSION__)
-#define __MSVCRT_VERSION__ 0x0700
-#endif
-
 #if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_NOWIDE_DYN_LINK)
 #ifdef BOOST_NOWIDE_SOURCE
 #define BOOST_NOWIDE_DECL BOOST_SYMBOL_EXPORT
--- boost_1_75_0/libs/nowide/standalone/config.hpp.orig	2021-04-05 16:24:52.922726300 +0200
+++ boost_1_75_0/libs/nowide/standalone/config.hpp	2021-04-05 16:26:20.590768400 +0200
@@ -11,13 +11,6 @@
 
 #include <boost/nowide/replacement.hpp>
 
-// MinGW32 requires a __MSVCRT_VERSION__ defined to make some functions available, e.g. _stat64
-// Hence define this here to target MSVC 7.0 which has the required functions and do it as early as possible
-// as including a system header might default this to 0x0600 which is to low
-#if defined(__MINGW32__) && !defined(__MSVCRT_VERSION__)
-#define __MSVCRT_VERSION__ 0x0700
-#endif
-
 #if(defined(__WIN32) || defined(_WIN32) || defined(WIN32)) && !defined(__CYGWIN__)
 #define NOWIDE_WINDOWS
 #endif