Initialise MinGW/build-aux CVS module.

diff --git a/ChangeLog b/ChangeLog
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+++ b/ChangeLog
@@ -0,0 +1,13 @@
+2010-04-16  Keith Marshall  <keithmarshall@users.sourceforge.net>
+
+       Initialise MinGW/build-aux CVS module.
+
+       * build-aux: New CVS module.
+       
+       * README ChangeLog: New files.
+       * m4: New directory; add it.
+       * m4/missing.m4: New file.
+
+       * CVSROOT/modules (modules): New self-referencing module; define it.
+       (missing.m4): New module reference to build-aux/m4/missing.m4; it will
+       incorporate m4/missing.m4 into any module embedding it.

diff --git a/README b/README
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+$Id$
+
+This README relates to the MinGW/build-aux CVS module.
+
+The MinGW/build-aux module is not intended for free-standing use.
+Rather, it serves as a collection point for general purpose code
+components, which are intended to facilitate the development of
+build systems for other modules; as such, individual components
+selected from build-aux may be incorporated into other modules
+by means of appropriate mapping entries in the CVS modules
+database.
+
+Developers wishing to deploy modules from MinGW/build-aux into
+their own MinGW hosted project should consult the administrator,
+to ensure that the appropriate references are established within
+the CVS modules database.
+
+Changes to MinGW/build-aux component modules may be initiated
+from any sandbox of any module which incorporates the affected
+component.  When making any such change, developers are requested
+to please ensure that the ChangeLog within MinGW/build-aux itself
+is appropriately updated.
+
+-- 
+Keith Marshall, 2010-04-16

diff --git a/m4/missing.m4 b/m4/missing.m4
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+++ b/m4/missing.m4
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+## missing.m4 -*- autoconf -*- vim: filetype=config
+##
+## $Id$
+##
+## Written by Keith Marshall <keithmarshall@users.sourceforge.net>
+## Copyright (C) 2010, MinGW Project
+##
+##
+## Autoconf macros to gracefully abort configure, on identified
+## non-availability of specified build prerequisites.
+##
+##
+## This is free software.  Permission is hereby granted to copy
+## and redistribute this software, either as is or in modified form,
+## subject only to the restrictions that the original author's notice
+## of copyright and disclaimers of warranty and of liability shall be
+## preserved without change in EVERY copy, and that modified copies
+## shall be clearly identified as such.
+##
+## This software is provided "as is", in the hope that it may prove
+## useful, but there is NO WARRANTY OF ANY KIND; not even an implied
+## WARRANTY OF MERCHANTABILITY, nor of FITNESS FOR A PARTICULAR PURPOSE.
+## Under no circumstances will the author, or the MinGW Project, accept
+## liability for any damages, however caused, arising from the use of
+## this software.
+
+
+# MINGW_AC_ASSERT_MISSING( PACKAGE, [TARNAME] )
+# ---------------------------------------------
+# Add PACKAGE to the list of prerequisite packages which are
+# identified as missing from the build system; this will then
+# be included in the diagnostic message which will be displayed,
+# if MINGW_AC_ABORT_IF_MISSING_PREREQ is subsequently invoked.
+#
+# If TARNAME is also specified, then it too will be included
+# in the message, as a recommended package to be installed in
+# order to satisfy the prerequisite.
+#
+AC_DEFUN([MINGW_AC_ASSERT_MISSING],
+[test -n "${mingw_ac_missing_list}" && {
+  mingw_ac_missing_plural=s mingw_ac_missing_appear=; }
+ mingw_ac_missing_list="${mingw_ac_missing_list}
+  $1"
+ test -n "$2" && { test -n "${mingw_ac_missing_providers}" && {
+  mingw_ac_missing_providers_plural=s; }
+  mingw_ac_missing_providers="${mingw_ac_missing_providers}
+  $2"; }
+])# MINGW_AC_ASSERT_MISSING
+
+# MINGW_AC_ABORT_IF_MISSING_PREREQ
+# --------------------------------
+# Invoked unconditionally after any MINGW_AC_ASSERT_MISSING request,
+# and prior to AC_OUTPUT, causes configure to abort with a diagnostic
+# message if any missing prerequisite has been identified.
+#
+AC_DEFUN([_MINGW_AC_ABORT_IF_MISSING_PREREQ],
+[test -n "$mingw_ac_missing_list" && { _MINGW_AC_SUGGEST_PROVIDERS
+ AC_MSG_ERROR([missing prerequisite${mingw_ac_missing_plural}:
+
+The following prerequisite package${mingw_ac_missing_plural} dnl
+appear${mingw_ac_missing_appear-s} to be missing from
+your system:--
+${mingw_ac_missing_list}]); }
+])# MINGW_AC_ABORT_IF_MISSING_PREREQ
+
+# _MINGW_AC_SUGGEST_PROVIDERS
+# ---------------------------
+# Helper macro, invoked only by MINGW_AC_ABORT_IF_MISSING_PREREQ;
+# it causes any TARNAME references from MINGW_AC_ASSERT_MISSING to
+# be itemised in the diagnostic output.
+#
+AC_DEFUN([_MINGW_AC_SUGGEST_PROVIDERS],
+[test -n "${mingw_ac_missing_providers}" && {
+  test -z "${mingw_ac_missing_providers_plural}" \
+    && mingw_ac_newer="a newer" \
+    || mingw_ac_newer=newer
+  mingw_ac_missing_list="${mingw_ac_missing_list}
+
+To continue building ${PACKAGE_TARNAME}, you should install the following
+or ${mingw_ac_newer} version${mingw_ac_missing_providers_plural} of:--
+${mingw_ac_missing_providers}
+
+and run configure again.
+"; }
+])# _MINGW_AC_SUGGEST_PROVIDERS
+
+# $RCSfile$: end of file