--- glib-2.58.0/gio/gwin32appinfo.c.orig	2018-08-30 19:12:08.000000000 +0200
+++ glib-2.58.0/gio/gwin32appinfo.c	2018-09-18 20:29:20.206457756 +0200
@@ -22,6 +22,7 @@
 
 #include "config.h"
 
+#include <wctype.h>
 #include <string.h>
 
 #include "gcontenttype.h"
--- glib-2.66.6/gio/gwin32registrykey.c.orig	2021-02-07 19:11:29.468421063 +0100
+++ glib-2.66.6/gio/gwin32registrykey.c	2021-02-07 19:51:00.202244362 +0100
@@ -25,12 +25,17 @@
 #pragma warning ( disable:4005 )
 #endif
 #include <windows.h>
+#ifdef __MINGW32__
+#include <ddk/ntstatus.h>
+#include <ddk/ntddk.h>
+#else
 #include <ntstatus.h>
 #include <winternl.h>
+#endif
 
 #include "gstrfuncsprivate.h"
 
-#ifndef _WDMDDK_
+#if !defined(_WDMDDK_) && !defined(_DDK_WINDDK_H)
 typedef enum _KEY_INFORMATION_CLASS {
   KeyBasicInformation,
   KeyNodeInformation,
--- glib-2.66.8/glib/gstdio.c.orig	2021-03-18 14:47:48.333693500 +0100
+++ glib-2.66.8/glib/gstdio.c	2021-05-22 12:33:01.585554332 +0200
@@ -39,6 +39,11 @@
 #include <io.h>
 #include <sys/utime.h>
 #include <stdlib.h> /* for MB_CUR_MAX */
+#include <ctype.h>
+#include <malloc.h>
+#ifdef __MINGW32__
+#include <winioctl.h>
+#endif
 #else
 #include <utime.h>
 #include <errno.h>
@@ -57,6 +62,7 @@
 #endif
 
 #if defined (G_OS_WIN32)
+#  if !defined(__MINGW32__)
 
 /* We can't include Windows DDK and Windows SDK simultaneously,
  * so let's copy this here from MinGW-w64 DDK.
@@ -93,6 +99,7 @@ typedef struct _REPARSE_DATA_BUFFER
     } GenericReparseBuffer;
   };
 } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
+#  endif
 
 static int
 w32_error_to_errno (DWORD error_code)
@@ -191,7 +198,7 @@ _g_win32_filetime_to_unix_time (const FI
   return result / hundreds_of_usec_per_sec;
 }
 
-#  ifdef _MSC_VER
+#  if defined(_MSC_VER) || defined(__MINGW32__)
 #    ifndef S_IXUSR
 #      define _S_IRUSR _S_IREAD
 #      define _S_IWUSR _S_IWRITE
@@ -199,9 +206,13 @@ _g_win32_filetime_to_unix_time (const FI
 #      define S_IRUSR _S_IRUSR
 #      define S_IWUSR _S_IWUSR
 #      define S_IXUSR _S_IXUSR
+#    endif
+#    ifndef S_IXGRP
 #      define S_IRGRP (S_IRUSR >> 3)
 #      define S_IWGRP (S_IWUSR >> 3)
 #      define S_IXGRP (S_IXUSR >> 3)
+#    endif
+#    ifndef S_IXOTH
 #      define S_IROTH (S_IRGRP >> 3)
 #      define S_IWOTH (S_IWGRP >> 3)
 #      define S_IXOTH (S_IXGRP >> 3)
--- glib-2.58.0/glib/giowin32.c.orig	2018-08-30 19:12:08.000000000 +0200
+++ glib-2.58.0/glib/giowin32.c	2018-09-15 10:12:54.423173008 +0200
@@ -70,6 +70,7 @@
 #include "glib.h"
 
 #include <stdlib.h>
+#include <winerror.h>
 #include <winsock2.h>
 #include <windows.h>
 #include <conio.h>
--- glib-2.58.0/gio/gioerror.c.orig	2018-08-30 19:12:08.000000000 +0200
+++ glib-2.58.0/gio/gioerror.c	2018-09-17 20:04:51.387461074 +0200
@@ -23,6 +23,7 @@
 #include "gioerror.h"
 
 #ifdef G_OS_WIN32
+#include <winerror.h>
 #include <winsock2.h>
 #endif
 
--- glib-2.66.0/gio/gnetworking.h.in.orig	2020-09-10 17:57:49.379170952 +0200
+++ glib-2.66.0/gio/gnetworking.h.in	2020-09-10 18:00:37.804925178 +0200
@@ -25,8 +25,11 @@
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <windns.h>
+#include <winerror.h>
 #include <mswsock.h>
+#ifndef __MINGW32__
 #include <wspiapi.h>
+#endif
 #include <iphlpapi.h>
 #undef interface
 
--- glib-2.58.0/gio/gwin32networkmonitor.c.orig	2018-08-30 19:12:08.000000000 +0200
+++ glib-2.58.0/gio/gwin32networkmonitor.c	2018-09-26 17:22:59.000209749 +0200
@@ -28,6 +28,7 @@
 
 #include <winsock2.h>
 #include <ws2tcpip.h>
+#include <netioapi.h>
 #include <iphlpapi.h>
 #include <stdio.h>
 
--- glib-2.66.8/glib/gutils.h.orig	2021-05-22 12:33:27.583570901 +0200
+++ glib-2.66.8/glib/gutils.h	2021-05-22 12:34:08.529030255 +0200
@@ -343,7 +343,7 @@ G_GNUC_END_IGNORE_DEPRECATIONS
  * wants the function to be called when it *itself* exits (or is
  * detached, in case the caller, too, is a DLL).
  */
-#if (defined(__MINGW_H) && !defined(_STDLIB_H_)) || (defined(_MSC_VER) && !defined(_INC_STDLIB))
+#if (defined(__MINGW_H) && !defined(_STDLIB_H_) && !defined(_STDLIB_H)) || (defined(_MSC_VER) && !defined(_INC_STDLIB))
 int atexit (void (*)(void));
 #endif
 #define g_atexit(func) atexit(func) GLIB_DEPRECATED_MACRO_IN_2_32
--- glib-2.60.0/glib/gstdio-private.c.orig	2019-03-04 21:06:14.000000000 +0100
+++ glib-2.60.0/glib/gstdio-private.c	2019-03-17 08:40:17.301017330 +0100
@@ -17,6 +17,8 @@
  * along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <wctype.h>
+
 /* Strips "\\\\?\\" extended prefix or
  * "\\??\\" NT Object Manager prefix from
  * @str in-place, using memmove.
--- glib-2.60.0/gio/tests/g-file-info.c.orig	2019-03-04 21:06:14.000000000 +0100
+++ glib-2.60.0/gio/tests/g-file-info.c	2019-03-17 20:58:44.544317727 +0100
@@ -30,6 +30,9 @@
 #include <stdio.h>
 #include <glib/gstdio.h>
 #include <windows.h>
+#ifdef __MINGW32__
+#include <winioctl.h>
+#endif
 #include <shlobj.h>
 #include <io.h> /* for _get_osfhandle */
 #endif
--- glib-2.60.0/gio/tests/network-address.c.orig	2019-03-04 21:06:14.000000000 +0100
+++ glib-2.60.0/gio/tests/network-address.c	2019-03-17 21:18:09.974670716 +0100
@@ -3,6 +3,9 @@
 
 #include <gio/gio.h>
 #include <gio/gnetworking.h>
+#ifdef __MINGW32__
+#include <ntddndis.h>
+#endif
 
 static void
 test_basic (void)
--- glib-2.62.0/glib/gtimezone.c.orig	2019-09-05 18:56:49.000000000 +0200
+++ glib-2.62.0/glib/gtimezone.c	2019-09-10 19:30:55.332089477 +0200
@@ -817,7 +817,7 @@
       for (year = first, i = 0; *rules != NULL && year <= last; year++)
         {
           gboolean failed = FALSE;
-          swprintf_s (s, 11, L"%d", year);
+          swprintf (s, 12, L"%d", year);
 
           if (!failed)
             {
--- glib-2.66.8/glib/gwin32.c.orig	2021-03-18 14:47:48.347693400 +0100
+++ glib-2.66.8/glib/gwin32.c	2021-05-22 12:35:00.835079487 +0200
@@ -891,7 +891,7 @@ g_console_win32_init (void)
       int          new_fd;
       int          preferred_fd = i;
       HANDLE       std_handle;
-      errno_t      errsv = 0;
+      int          errsv = 0;
 
       if (!streams[i].redirect)
         continue;
@@ -1109,7 +1109,7 @@ g_win32_veh_handler (PEXCEPTION_POINTERS
       return EXCEPTION_CONTINUE_SEARCH;
     }
 
-  fprintf_s (stderr,
+  fprintf (stderr,
              "Exception code=0x%lx flags=0x%lx at 0x%p",
              er->ExceptionCode,
              er->ExceptionFlags,
@@ -1118,7 +1118,7 @@ g_win32_veh_handler (PEXCEPTION_POINTERS
   switch (er->ExceptionCode)
     {
     case EXCEPTION_ACCESS_VIOLATION:
-      fprintf_s (stderr,
+      fprintf (stderr,
                  ". Access violation - attempting to %s at address 0x%p\n",
                  er->ExceptionInformation[0] == 0 ? "read data" :
                  er->ExceptionInformation[0] == 1 ? "write data" :
@@ -1127,7 +1127,7 @@ g_win32_veh_handler (PEXCEPTION_POINTERS
                  (void *) er->ExceptionInformation[1]);
       break;
     case EXCEPTION_IN_PAGE_ERROR:
-      fprintf_s (stderr,
+      fprintf (stderr,
                  ". Page access violation - attempting to %s at address 0x%p with status %Ix\n",
                  er->ExceptionInformation[0] == 0 ? "read from an inaccessible page" :
                  er->ExceptionInformation[0] == 1 ? "write to an inaccessible page" :
@@ -1137,7 +1137,7 @@ g_win32_veh_handler (PEXCEPTION_POINTERS
                  er->ExceptionInformation[2]);
       break;
     default:
-      fprintf_s (stderr, "\n");
+      fprintf (stderr, "\n");
       break;
     }
 
--- glib-2.62.0/glib/gwin32-private.c.orig	2019-09-05 18:56:49.000000000 +0200
+++ glib-2.62.0/glib/gwin32-private.c	2019-09-10 19:45:50.857238001 +0200
@@ -40,10 +40,10 @@
   char event_str[STR_BUFFER_SIZE] = {0};
   gsize event_str_len;
 
-  _snprintf_s (pid_str, STR_BUFFER_SIZE, G_N_ELEMENTS (pid_str), "%lu", pid);
+  snprintf (pid_str, STR_BUFFER_SIZE, "%lu", pid);
   pid_str[G_N_ELEMENTS (pid_str) - 1] = 0;
   pid_str_len = strlen (pid_str);
-  _snprintf_s (event_str, STR_BUFFER_SIZE, G_N_ELEMENTS (pid_str), "%Iu", event);
+  snprintf (event_str, STR_BUFFER_SIZE, "%Iu", event);
   event_str[G_N_ELEMENTS (pid_str) - 1] = 0;
   event_str_len = strlen (event_str);
 #undef STR_BUFFER_SIZE