New file. Contents taken from the old aclocal.m4, but changed to

match the contents of libisc.

acinclude.m4

+dnl $Id: acinclude.m4,v 1.1 1998/07/08 13:29:48 ceder Exp $
+dnl Copyright (C) 1994, 1995  Lysator Academic Computer Association.
+dnl
+dnl This file is part of the LysKOM server.
+dnl 
+dnl LysKOM is free software; you can redistribute it and/or modify it
+dnl under the terms of the GNU General Public License as published by 
+dnl the Free Software Foundation; either version 1, or (at your option) 
+dnl any later version.
+dnl 
+dnl LysKOM is distributed in the hope that it will be useful, but WITHOUT
+dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+dnl FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+dnl for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with LysKOM; see the file COPYING.  If not, write to
+dnl Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
+dnl or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
+dnl MA 02139, USA.
+dnl
+dnl Please mail bug reports to bug-lyskom@lysator.liu.se. 
+dnl
+
+dnl
+dnl Check if an option is acceptable to the C compiler in use.
+dnl (This is taken verbatim from cmod 1.0.  Please don't make even a
+dnl tiny change to it unless you change the name of all variables!
+dnl See the cmod source code for more information.)
+dnl
+AC_DEFUN(CMOD_COMPILER_CC_ACCEPTS,
+[cmod_safe=`echo "cmod_cv_compiler_${CC}_accepts_$1" | tr '+./=\055' 'X____'`
+AC_MSG_CHECKING([whether ${CC} accepts $1])
+AC_CACHE_VAL($cmod_safe,
+[[cmod_oldflags=$CFLAGS
+CFLAGS="$CFLAGS $1"]
+AC_TRY_LINK(,,
+	[eval "$cmod_safe=yes"],
+	[eval "$cmod_safe=no"])
+[CFLAGS=$cmod_oldflags]])dnl
+AC_MSG_RESULT([`eval echo '$'$cmod_safe`])
+if test `eval echo '$'$cmod_safe` = yes; then
+  CFLAGS="$CFLAGS $1"
+fi])dnl
+dnl
+dnl Another frozen defun.
+dnl
+AC_DEFUN(CMOD_C_ATTRIBUTE_UNUSED,
+[AC_MSG_CHECKING([whether $CC understands __attribute__((unused))])
+AC_CACHE_VAL([cmod_cv_c_attribute_unused_understood],
+    AC_TRY_COMPILE(,[int i __attribute__((unused));],
+	[cmod_cv_c_attribute_unused_understood=yes],
+	[cmod_cv_c_attribute_unused_understood=no]))
+AC_MSG_RESULT($cmod_cv_c_attribute_unused_understood)
+[if test $cmod_cv_c_attribute_unused_understood = yes ; then]
+    AC_DEFINE(HAVE_ATTRIBUTE_UNUSED)
+[fi]])dnl