diff --git a/Porting/Maintainers.pl b/Porting/Maintainers.pl
index 25905df689e7..69d4ffe2d3e7 100755
--- a/Porting/Maintainers.pl
+++ b/Porting/Maintainers.pl
@@ -1289,6 +1289,10 @@ package Maintainers;
     'Win32' => {
         'DISTRIBUTION' => "JDB/Win32-0.57.tar.gz",
         'FILES'        => q[cpan/Win32],
+        'CUSTOMIZED'   => [
+            'Win32.xs',
+            'Win32.pm'
+        ]
     },
 
     'Win32API::File' => {
diff --git a/cpan/Win32/Win32.pm b/cpan/Win32/Win32.pm
index 1092c5ab521b..52c2be4ccbfd 100644
--- a/cpan/Win32/Win32.pm
+++ b/cpan/Win32/Win32.pm
@@ -8,7 +8,7 @@ package Win32;
     require DynaLoader;
 
     @ISA = qw|Exporter DynaLoader|;
-    $VERSION = '0.57';
+    $VERSION = '0.57_01';
     $XS_VERSION = $VERSION;
     $VERSION = eval $VERSION;
 
diff --git a/cpan/Win32/Win32.xs b/cpan/Win32/Win32.xs
index ca7519f0d60e..d92aaa45cf39 100644
--- a/cpan/Win32/Win32.xs
+++ b/cpan/Win32/Win32.xs
@@ -98,6 +98,12 @@ typedef LONG (WINAPI *PFNRegGetValueA)(HKEY, LPCSTR, LPCSTR, DWORD, LPDWORD, PVO
 #ifndef CSIDL_FLAG_CREATE
 #   define CSIDL_FLAG_CREATE          0x8000
 #endif
+#ifndef SE_PRIVILEGE_REMOVED
+#  define SE_PRIVILEGE_REMOVED        0x0004
+#endif
+#ifndef KEY_WOW64_64KEY
+#  define KEY_WOW64_64KEY             0x0100
+#endif
 
 /* Use explicit struct definition because wSuiteMask and
  * wProductType are not defined in the VC++ 6.0 headers.
diff --git a/dist/Time-HiRes/HiRes.pm b/dist/Time-HiRes/HiRes.pm
index 9377c3479fbd..c75f5cd28843 100644
--- a/dist/Time-HiRes/HiRes.pm
+++ b/dist/Time-HiRes/HiRes.pm
@@ -50,7 +50,7 @@ our @EXPORT_OK = qw (usleep sleep ualarm alarm gettimeofday time tv_interval
                  stat lstat utime
                 );
 
-our $VERSION = '1.9767';
+our $VERSION = '1.9768';
 our $XS_VERSION = $VERSION;
 $VERSION = eval $VERSION;
 
diff --git a/dist/Time-HiRes/HiRes.xs b/dist/Time-HiRes/HiRes.xs
index 1b97962b3a6e..a13f2c27ce3d 100644
--- a/dist/Time-HiRes/HiRes.xs
+++ b/dist/Time-HiRes/HiRes.xs
@@ -11,6 +11,15 @@
  * it under the same terms as Perl itself.
  */
 
+#if defined(__MINGW32__)
+/* This hides clock_gettime() and friends to avoid conflicts with our own
+ * implementation. This is especially important in the case of modern versions
+ * of MinGW.org which define clockid_t as an opaque pointer.
+ * Both MinGW.org and MinGW-w64 honor this flag. */
+#undef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 1L
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/t/porting/customized.dat b/t/porting/customized.dat
index 1156cd9fa207..c1586ac95cfc 100644
--- a/t/porting/customized.dat
+++ b/t/porting/customized.dat
@@ -21,6 +21,8 @@ Net::Ping dist/Net-Ping/t/500_ping_icmp.t 3eeb60181c01b85f876bd6658644548fdf2e24
 Net::Ping dist/Net-Ping/t/501_ping_icmpv6.t 54373de5858f8fb7e078e4998a4b3b8dbca91783
 Pod::Perldoc cpan/Pod-Perldoc/lib/Pod/Perldoc.pm 582be34c077c9ff44d99914724a0cc2140bcd48c
 Test::Harness cpan/Test-Harness/t/source.t aaa3939591114c0c52ecd44159218336d1f762b9
+Win32 cpan/Win32/Win32.pm fd81bcc98849858c2d0a08f3e96e7f6d10b007dc
+Win32 cpan/Win32/Win32.xs 277a5d64dc2ff741e14ebfabfb1b38283f4be531
 Win32API::File cpan/Win32API-File/File.pm 8fd212857f821cb26648878b96e57f13bf21b99e
 Win32API::File cpan/Win32API-File/File.xs beb870fed4490d2faa547b4a8576b8d64d1d27c5
 version cpan/version/lib/version.pm 9a4d4c2a89cc95c0c946de6742d6df41e546c12c
diff --git a/win32/win32.c b/win32/win32.c
index 861e707760fa..7318aeff86c0 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -3161,15 +3161,31 @@ win32_fflush(FILE *pf)
 DllExport Off_t
 win32_ftell(FILE *pf)
 {
+#if defined(_MSC_VER) && _MSC_VER < 1500
+    /* Visual C++ 2005 does have _ftelli64(), but the compiler in Windows 2003
+     * SP1 PSDK doesn't and they both have the same _MSC_VER (1400). */
     fpos_t pos;
     if (fgetpos(pf, &pos))
         return -1;
     return (Off_t)pos;
+#elif defined(__MINGW32__) && !defined(_UCRT) && \
+       (!defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 9)
+    /* _ftelli64() causes link issues in MinGW.org and it's buggy in MinGW-w64
+     * 9.0 and older:
+     * https://sourceforge.net/p/mingw-w64/mingw-w64/ci/edeeef2aadd9e2f4109dec3f624aafea60cee9bb
+     */
+    return ftello64(pf);
+#else
+    return _ftelli64(pf);
+#endif
 }
 
 DllExport int
 win32_fseek(FILE *pf, Off_t offset,int origin)
 {
+#if defined(_MSC_VER) && _MSC_VER < 1500
+    /* Visual C++ 2005 does have _fseeki64(), but the compiler in Windows 2003
+     * SP1 PSDK doesn't and they both have the same _MSC_VER (1400). */
     fpos_t pos;
     switch (origin) {
     case SEEK_CUR:
@@ -3189,6 +3205,16 @@ win32_fseek(FILE *pf, Off_t offset,int origin)
         return -1;
     }
     return fsetpos(pf, &offset);
+#elif defined(__MINGW32__) && !defined(_UCRT) && \
+       (!defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 9)
+    /* _fseeki64() causes link issues in MinGW.org and it's buggy in MinGW-w64
+     * 9.0 and older:
+     * https://sourceforge.net/p/mingw-w64/mingw-w64/ci/edeeef2aadd9e2f4109dec3f624aafea60cee9bb
+     */
+    return fseeko64(pf, offset, origin);
+#else
+    return _fseeki64(pf, offset, origin);
+#endif
 }
 
 DllExport int
diff --git a/win32/win32sck.c b/win32/win32sck.c
index ef5c682101c8..168cd06eb80f 100644
--- a/win32/win32sck.c
+++ b/win32/win32sck.c
@@ -492,7 +492,7 @@ win32_select(int nfds, Perl_fd_set* rd, Perl_fd_set* wr, Perl_fd_set* ex, const
 {
     int r;
     int i, fd, save_errno = errno;
-    FD_SET nrd, nwr, nex;
+    fd_set nrd, nwr, nex;
     bool just_sleep = TRUE;
 
     StartSockets();