diff -rupN --no-dereference Python-3.10.9/Python/pylifecycle.c Python-3.10.9-new/Python/pylifecycle.c
--- Python-3.10.9/Python/pylifecycle.c	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/Python/pylifecycle.c	2022-12-08 09:36:55.417024773 +0100
@@ -41,6 +41,26 @@
 #define PUTS(fd, str) _Py_write_noraise(fd, str, (int)strlen(str))
 
 
+#if defined(__MINGW32__) && defined(PY_COERCE_C_LOCALE)
+static int
+setenv (const char *var, const char *val, int ovr)
+{
+  BOOL b;
+  char c[2];
+  if (!ovr)
+  {
+    DWORD d;
+    d = GetEnvironmentVariableA (var, c, 2);
+    if (0 != d && GetLastError () != ERROR_ENVVAR_NOT_FOUND)
+      return 1;
+  }
+  b = SetEnvironmentVariableA (var, val);
+  if (b)
+    return 0;
+  return 1;
+}
+#endif
+
 _Py_IDENTIFIER(flush);
 _Py_IDENTIFIER(name);
 _Py_IDENTIFIER(stdin);