Add sysconf _SC_PAGE_SIZE.

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index f85fdc7552e5b53a80b6d7eb7a26bf0f89f77822..431d73436ec27b15b56e0cbebe4d33da8bfff20b 100644 (file)
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -3613,6 +3613,13 @@ strnlen ("foobar", 8) = 6
 strnlen ("foobar", 9) = 6
 @end example
 
+@item @code{sysconf}
+@c @fuindex sysconf
+@prindex @code{sysconf}
+@code{_SC_PAGESIZE} is standard, but some older systems (eg.@: HP-UX
+9) have @code{_SC_PAGE_SIZE} instead.  This can be tested with
+@code{#ifdef}.
+
 @item @code{unlink}
 @c @fuindex unlink
 @prindex @code{unlink}