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diff --git a/gr-howto-write-a-block/config/ax_boost_filesystem.m4 b/gr-howto-write-a-block/config/ax_boost_filesystem.m4
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+#
+# SYNOPSIS
+#
+#   AX_BOOST_FILESYSTEM
+#
+# DESCRIPTION
+#
+#   Test for Filesystem library from the Boost C++ libraries. The macro
+#   requires a preceding call to AX_BOOST_BASE. 
+#
+#   This macro calls:
+#
+#     AC_SUBST(BOOST_FILESYSTEM_LIB)
+#
+#   And sets:
+#
+#     HAVE_BOOST_FILESYSTEM
+#
+# 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_FILESYSTEM],
+[
+    AC_REQUIRE([AX_BOOST_BASE])
+
+    dnl depends on boost_system
+    AC_REQUIRE([AX_BOOST_SYSTEM])
+    axbf_LDFLAGS_SAVED=$LDFLAGS
+    LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LIB"
+
+    _AX_BOOST_CHECK([boost_filesystem],
+		    [@%:@include <boost/filesystem/path.hpp>],
+		    [using namespace boost::filesystem;
+                     path my_path( "foo/bar/data.txt" );
+                     return 0;])
+
+   LDFLAGS=$axbf_LDFLAGS_SAVED
+])