with and as are now keywords.  There are some generated files I can't recreate.
diff --git a/Include/code.h b/Include/code.h
index 6c0e706..744c1a6 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -52,7 +52,9 @@
 /* This should be defined if a future statement modifies the syntax.
    For example, when a keyword is added.
 */
+#if 0
 #define PY_PARSER_REQUIRES_FUTURE_KEYWORD
+#endif
 
 #define CO_MAXBLOCKS 20 /* Max static block nesting within a function */