2008-12-20  Bruno Haible  <address@hidden>

	* doc/install.texi (Particular Systems): For HP-UX, also recommend
	-D_XOPEN_SOURCE=500. Needed for the declaration of mbstate_t on
	HP-UX 11.11.
	* lib/autoconf/c.m4 (_AC_PROG_CC_C89): Combine -Aa and -Ae with
	-D_XOPEN_SOURCE=500.

--- doc/install.texi.orig	2008-12-20 12:58:46.000000000 +0100
+++ doc/install.texi	2008-12-20 12:57:03.000000000 +0100
@@ -188,7 +188,7 @@
 use an ANSI C compiler:
 
 @example
-./configure CC="cc -Ae"
+./configure CC="cc -Ae -D_XOPEN_SOURCE=500"
 @end example
 
 @noindent
--- lib/autoconf/c.m4.orig	2008-12-20 12:58:46.000000000 +0100
+++ lib/autoconf/c.m4	2008-12-20 12:58:24.000000000 +0100
@@ -1003,11 +1003,12 @@
 dnl AIX circa 2003	-qlanglvl=extc89
 dnl old AIX		-qlanglvl=ansi
 dnl Ultrix, OSF/1, Tru64	-std
-dnl HP-UX 10.20 and later	-Ae
-dnl HP-UX older versions	-Aa -D_HPUX_SOURCE
+dnl HP-UX 10.20 and later	-Ae -D_XOPEN_SOURCE=500
+dnl HP-UX older versions	-Aa -D_HPUX_SOURCE -D_XOPEN_SOURCE=500
 dnl SVR4			-Xc -D__EXTENSIONS__
 [-qlanglvl=extc89 -qlanglvl=ansi -std \
-	-Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"], [$1], [$2])[]dnl
+ "-Ae -D_XOPEN_SOURCE=500 "-Aa -D_HPUX_SOURCE -D_XOPEN_SOURCE=500" 
+ "-Xc -D__EXTENSIONS__"], [$1], [$2])[]dnl
 ])# _AC_PROG_CC_C89