Document the rule that Python.h must be included before any standard
headers. This is the final checkin for SF bug #458768.
diff --git a/Doc/api/api.tex b/Doc/api/api.tex
index b3a32d1..2527bd6 100644
--- a/Doc/api/api.tex
+++ b/Doc/api/api.tex
@@ -76,6 +76,9 @@
This implies inclusion of the following standard headers:
\code{<stdio.h>}, \code{<string.h>}, \code{<errno.h>},
\code{<limits.h>}, and \code{<stdlib.h>} (if available).
+Since Python may define some pre-processor definitions which affect
+the standard headers on some systems, you must include \file{Python.h}
+before any standard headers are included.
All user visible names defined by Python.h (except those defined by
the included standard headers) have one of the prefixes \samp{Py} or