+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_check_sign.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_SIGN (TYPE, [ACTION-IF-SIGNED], [ACTION-IF-UNSIGNED], [INCLUDES])
+#
+# DESCRIPTION
+#
+# Checks whether TYPE is signed or not. If no INCLUDES are specified, the
+# default includes are used. If ACTION-IF-SIGNED is given, it is
+# additional shell code to execute when the type is signed. If
+# ACTION-IF-UNSIGNED is given, it is executed when the type is unsigned.
+#
+# This macro assumes that the type exists. Therefore the existence of the
+# type should be checked before calling this macro. For example:
+#
+# AC_CHECK_HEADERS([wchar.h])
+# AC_CHECK_TYPE([wchar_t],,[ AC_MSG_ERROR([Type wchar_t not found.]) ])
+# AX_CHECK_SIGN([wchar_t],
+# [ AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ],
+# [ AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned]) ], [
+# #ifdef HAVE_WCHAR_H
+# #include <wchar.h>
+# #endif
+# ])
+#
+# LICENSE
+#
+# Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 6
+