mmap.PROT_READ does not exists on win32;
Skip this test created by r60830.
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index 2d87ead..8a145cf 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -427,6 +427,8 @@
         anon_mmap(PAGESIZE)
 
     def test_prot_readonly(self):
+        if not hasattr(mmap, 'PROT_READ'):
+            return
         mapsize = 10
         open(TESTFN, "wb").write("a"*mapsize)
         f = open(TESTFN, "rb")