diff --git a/configure b/configure
index 29009ee6d885e8fd09922e34e9fcd069d1295da4..f14454e691b361d41e6a86eb1d662b6309386690 100755
--- a/configure
+++ b/configure
@@ -1736,6 +1736,37 @@ else
   l2tpv3=no
 fi
 
+##########################################
+# MinGW / Mingw-w64 localtime_r/gmtime_r check
+
+if test "$mingw32" = "yes"; then
+    # Some versions of MinGW / Mingw-w64 lack localtime_r
+    # and gmtime_r entirely.
+    #
+    # Some versions of Mingw-w64 define a macro for
+    # localtime_r/gmtime_r.
+    #
+    # Some versions of Mingw-w64 will define functions
+    # for localtime_r/gmtime_r, but only if you have
+    # _POSIX_THREAD_SAFE_FUNCTIONS defined. For fun
+    # though, unistd.h and pthread.h both define
+    # that for you.
+    #
+    # So this #undef localtime_r and #include <unistd.h>
+    # are not in fact redundant.
+cat > $TMPC << EOF
+#include <unistd.h>
+#include <time.h>
+#undef localtime_r
+int main(void) { localtime_r(NULL, NULL); return 0; }
+EOF
+    if compile_prog "" "" ; then
+        localtime_r="yes"
+    else
+        localtime_r="no"
+    fi
+fi
+
 ##########################################
 # pkg-config probe
 
@@ -5034,6 +5065,9 @@ fi
 if test "$zero_malloc" = "yes" ; then
   echo "CONFIG_ZERO_MALLOC=y" >> $config_host_mak
 fi
+if test "$localtime_r" = "yes" ; then
+  echo "CONFIG_LOCALTIME_R=y" >> $config_host_mak
+fi
 if test "$qom_cast_debug" = "yes" ; then
   echo "CONFIG_QOM_CAST_DEBUG=y" >> $config_host_mak
 fi
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index ab3c8766b463744ea0584c71081bddb808843477..ef21efb6832a7674163733f3c8ef4cf0d742deae 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -38,10 +38,12 @@
 #include <strings.h>
 #include <inttypes.h>
 #include <limits.h>
+/* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
+ * function availability on recentish Mingw-w64 platforms. */
+#include <unistd.h>
 #include <time.h>
 #include <ctype.h>
 #include <errno.h>
-#include <unistd.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/time.h>
diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h
index 706d85a98e24f48aa763e9c448ac128ec9f1ee76..13dcef6b4c99a5cc2834830dae9756293d29dcb8 100644
--- a/include/sysemu/os-win32.h
+++ b/include/sysemu/os-win32.h
@@ -73,10 +73,12 @@
 #define siglongjmp(env, val) longjmp(env, val)
 
 /* Missing POSIX functions. Don't use MinGW-w64 macros. */
+#ifndef CONFIG_LOCALTIME_R
 #undef gmtime_r
 struct tm *gmtime_r(const time_t *timep, struct tm *result);
 #undef localtime_r
 struct tm *localtime_r(const time_t *timep, struct tm *result);
+#endif /* CONFIG_LOCALTIME_R */
 
 
 static inline void os_setup_signal_handling(void) {}
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 730a6707a09de6a1cb9e0d95d3cb74218e61ed10..08f5a9cda2bb6e58f683d2afeac6bc115060f2d4 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -95,6 +95,7 @@ void qemu_anon_ram_free(void *ptr, size_t size)
     }
 }
 
+#ifndef CONFIG_LOCALTIME_R
 /* FIXME: add proper locking */
 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 {
@@ -118,6 +119,7 @@ struct tm *localtime_r(const time_t *timep, struct tm *result)
     }
     return p;
 }
+#endif /* CONFIG_LOCALTIME_R */
 
 void qemu_set_block(int fd)
 {