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+dnl Autoconf macros for checking for aggregate type members
+dnl Copyright (C) 1996, 1997, 1998, 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
+dnl Mostly written by Miles Bader <firstname.lastname@example.org>
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+dnl GNU General Public License for more details.
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+dnl AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos'.
+dnl The member itself can be of an aggregate type
+dnl Shell variables are not a valid argument.
+ [AC_FATAL([$0: requires literal arguments])])dnl
+m4_bmatch([$1], [\.], ,
+ [m4_fatal([$0: Did not see any dot in `$1'])])dnl
+dnl Extract the aggregate name, and the member name
+AC_CACHE_CHECK([for $1], ac_Member,
+[dnl AGGREGATE ac_aggr;
+static m4_bpatsubst([$1], [\..*]) ac_aggr;
+if (sizeof(ac_aggr.m4_bpatsubst([$1], [^[^.]*\.])))
+ [AS_VAR_SET(ac_Member, yes)],
+ [AS_VAR_SET(ac_Member, no)])])
+AS_IF([test AS_VAR_GET(ac_Member) = yes], [$2], [$3])
+dnl IU_CHECK_MEMBERS([AGGREGATE.MEMBER, ...],
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]
+ [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_AC_Member), 1,
+ [Define to 1 if `]m4_bpatsubst(AC_Member,
+ [^[^.]*\.])[' is
+ member of `]m4_bpatsubst(AC_Member, [\..*])['.])