--- setup.py.orig	2021-05-05 12:35:30.000000000 -0600
+++ setup.py	2021-05-05 12:38:18.000000000 -0600
@@ -810,12 +810,6 @@
         if feature.tiff:
             libs.append(feature.tiff)
             defs.append(("HAVE_LIBTIFF", None))
-            if sys.platform == "win32":
-                # This define needs to be defined if-and-only-if it was defined
-                # when compiling LibTIFF. LibTIFF doesn't expose it in `tiffconf.h`,
-                # so we have to guess; by default it is defined in all Windows builds.
-                # See #4237, #5243, #5359 for more information.
-                defs.append(("USE_WIN32_FILEIO", None))
         if feature.xcb:
             libs.append(feature.xcb)
             defs.append(("HAVE_XCB", None))