Issue 10882: add os.sendfile(). (patch provided by Ross Lagerwall)
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 833f79e..d55c1cd 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1024,6 +1024,9 @@
 /* The size of `size_t', as computed by sizeof. */
 #undef SIZEOF_SIZE_T
 
+/* Define to 1 if you have the `sendfile' function. */
+#undef HAVE_SENDFILE
+
 /* The size of `time_t', as computed by sizeof. */
 #undef SIZEOF_TIME_T