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diff --git a/gr-howto-write-a-block/config/ax_boost_date_time.m4 b/gr-howto-write-a-block/config/ax_boost_date_time.m4
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+#
+# SYNOPSIS
+#
+#   AX_BOOST_DATE_TIME
+#
+# DESCRIPTION
+#
+#   Test for date_time library from the Boost C++ libraries.
+#
+#   This macro calls:
+#
+#     AC_SUBST(BOOST_DATE_TIME_LIB)
+#
+#   And sets:
+#
+#     HAVE_BOOST_DATE_TIME
+#
+# COPYLEFT
+#
+#   Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
+#   Copyright (c) 2008 Michael Tindal
+#   Copyright (c) 2008 Free Software Foundation, Inc.
+#
+#   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.
+
+AC_DEFUN([AX_BOOST_DATE_TIME],
+[
+    AC_REQUIRE([AX_BOOST_BASE])	
+    _AX_BOOST_CHECK([boost_date_time],
+		    [@%:@include <boost/date_time/gregorian/gregorian_types.hpp>],
+		    [using namespace boost::gregorian; date d(2002,Jan,10); return 0;])
+])