Indent the #error directives so a classic K&R cpp doesn't see them.
diff --git a/Python/compile.c b/Python/compile.c
index e6918a9..155142a 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -63,13 +63,13 @@
(which defines too many confusing symbols), but we can check here
that they haven't changed (which is very unlikely, but possible). */
#if Py_single_input != single_input
-#error "single_input has changed -- update Py_single_input in Python.h"
+ #error "single_input has changed -- update Py_single_input in Python.h"
#endif
#if Py_file_input != file_input
-#error "file_input has changed -- update Py_file_input in Python.h"
+ #error "file_input has changed -- update Py_file_input in Python.h"
#endif
#if Py_eval_input != eval_input
-#error "eval_input has changed -- update Py_eval_input in Python.h"
+ #error "eval_input has changed -- update Py_eval_input in Python.h"
#endif
int Py_OptimizeFlag = 0;