HAVE_LIMITS_H -- raise #error if not defined; limits.h is std C
ULONG_MAX -- removed; std C requires it in limits.h
LONGLONG_MAX -- removed; never used
ULONGLONGMAX -- removed; never used
diff --git a/Include/Python.h b/Include/Python.h
index d4afdaf..32efa0c 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -33,6 +33,8 @@
#ifdef HAVE_LIMITS_H
#include <limits.h>
+#else
+#error "limits.h is required by std C -- why isn't HAVE_LIMITS_H defined?"
#endif
#if defined(__sgi) && defined(WITH_THREAD) && !defined(_SGI_MP_SOURCE)