--- gcc-5.4.0/libgfortran/intrinsics/chmod.c.orig	2016-12-18 10:38:13.034904609 +0100
+++ gcc-5.4.0/libgfortran/intrinsics/chmod.c	2016-12-18 10:38:15.398237920 +0100
@@ -30,6 +30,9 @@
 #include <string.h>	/* For memcpy. */
 #include <stdlib.h>	/* For free.  */
 #include <sys/stat.h>	/* For stat, chmod and umask.  */
+#ifdef __MINGW32__
+#include <io.h>
+#endif
 
 
 /* INTEGER FUNCTION CHMOD (NAME, MODE)
--- gcc-7.5.0/libstdc++-v3/libsupc++/new_opa.cc.orig	2019-10-24 17:31:00.754226000 +0200
+++ gcc-7.5.0/libstdc++-v3/libsupc++/new_opa.cc	2019-12-26 09:33:51.155818937 +0100
@@ -29,10 +29,13 @@
 #include <bits/exception_defines.h>
 #include "new"
 
-#if !_GLIBCXX_HAVE_ALIGNED_ALLOC && !_GLIBCXX_HAVE__ALIGNED_MALLOC \
-  && !_GLIBCXX_HAVE_POSIX_MEMALIGN && _GLIBCXX_HAVE_MEMALIGN
+#if !_GLIBCXX_HAVE_ALIGNED_ALLOC && (!_GLIBCXX_HAVE__ALIGNED_MALLOC || defined(__MINGW32__)) \
+  && !_GLIBCXX_HAVE_POSIX_MEMALIGN && (_GLIBCXX_HAVE_MEMALIGN || defined(__MINGW32__))
 # if _GLIBCXX_HOSTED && __has_include(<malloc.h>)
 // Some C libraries declare memalign in <malloc.h>
+#  ifdef __MINGW32__
+#    define __MSVCRT_VERSION__ 0x0700
+#  endif
 #  include <malloc.h>
 # else
 extern "C" void *memalign(std::size_t boundary, std::size_t size);
--- gcc-7.5.0/libstdc++-v3/libsupc++/del_opa.cc.orig	2017-01-26 15:30:45.014860000 +0100
+++ gcc-7.5.0/libstdc++-v3/libsupc++/del_opa.cc	2019-12-26 09:41:01.210155799 +0100
@@ -40,6 +40,16 @@
 
 #include "new"
 
+#if !_GLIBCXX_HAVE_ALIGNED_ALLOC && (!_GLIBCXX_HAVE__ALIGNED_MALLOC || defined(__MINGW32__)) \
+  && !_GLIBCXX_HAVE_POSIX_MEMALIGN && (_GLIBCXX_HAVE_MEMALIGN || defined(__MINGW32__))
+# if _GLIBCXX_HOSTED && __has_include(<malloc.h>)
+#  ifdef __MINGW32__
+#    define __MSVCRT_VERSION__ 0x0700
+#  endif
+#  include <malloc.h>
+# endif
+#endif
+
 // The sized deletes are defined in other files.
 #pragma GCC diagnostic ignored "-Wsized-deallocation"