diff -rupN --no-dereference Python-3.10.0rc1/Modules/selectmodule.c Python-3.10.0rc1-new/Modules/selectmodule.c
--- Python-3.10.0rc1/Modules/selectmodule.c	2021-08-02 21:53:59.000000000 +0200
+++ Python-3.10.0rc1-new/Modules/selectmodule.c	2021-08-04 16:37:01.696334274 +0200
@@ -136,9 +136,9 @@ seq2set(PyObject *seq, fd_set *set, pyli
         v = PyObject_AsFileDescriptor( o );
         if (v == -1) goto finally;
 
-#if defined(_MSC_VER)
+#if defined(MS_WIN32)
         max = 0;                             /* not used for Win32 */
-#else  /* !_MSC_VER */
+#else  /* !MS_WIN32 */
         if (!_PyIsSelectable_fd(v)) {
             PyErr_SetString(PyExc_ValueError,
                         "filedescriptor out of range in select()");
@@ -146,7 +146,7 @@ seq2set(PyObject *seq, fd_set *set, pyli
         }
         if (v > max)
             max = v;
-#endif /* _MSC_VER */
+#endif /* MS_WIN32 */
         FD_SET(v, set);
 
         /* add object and its file descriptor to the list */
diff -rupN --no-dereference Python-3.10.0rc1/setup.py Python-3.10.0rc1-new/setup.py
--- Python-3.10.0rc1/setup.py	2021-08-04 16:37:01.473336519 +0200
+++ Python-3.10.0rc1-new/setup.py	2021-08-04 16:37:01.697334264 +0200
@@ -1001,7 +1001,11 @@ class PyBuildExt(build_ext):
             self.missing.append('spwd')
 
         # select(2); not on ancient System V
-        self.add(Extension('select', ['selectmodule.c']))
+        select_libs = []
+        if HOST_PLATFORM.startswith(('mingw', 'win')):
+            select_libs += ['ws2_32']
+        self.add(Extension('select', ['selectmodule.c'],
+                               libraries=select_libs) )
 
         # Memory-mapped files (also works on Win32).
         self.add(Extension('mmap', ['mmapmodule.c']))