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diff --git a/gr-howto-write-a-block/config/ax_boost_thread.m4 b/gr-howto-write-a-block/config/ax_boost_thread.m4
new file mode 100644
index 00000000..4df23224
--- /dev/null
+++ b/gr-howto-write-a-block/config/ax_boost_thread.m4
@@ -0,0 +1,72 @@
+#
+# SYNOPSIS
+#
+#   AX_BOOST_THREAD
+#
+# DESCRIPTION
+#
+#   Test for Thread library from the Boost C++ libraries.
+#
+#   This macro calls:
+#
+#     AC_SUBST(BOOST_THREAD_LIB)
+#     AC_SUBST(BOOST_CXXFLAGS)
+#
+#   And sets:
+#
+#     HAVE_BOOST_THREAD
+#
+# 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_THREAD],
+[
+    AC_REQUIRE([AX_BOOST_BASE])
+    AC_REQUIRE([ACX_PTHREAD])
+    _AX_BOOST_WITH([boost_thread])
+
+    if test "$want_boost" = "yes"; then
+        AC_REQUIRE([AC_PROG_CC])
+        AC_REQUIRE([AC_PROG_CXX])
+        AC_REQUIRE([AC_CANONICAL_HOST])
+
+        CPPFLAGS_SAVED="$CPPFLAGS"
+        LDFLAGS_SAVED="$LDFLAGS"
+	CXXFLAGS_SAVED="$CXXFLAGS"
+
+        CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
+        LDFLAGS="$LDFLAGS $BOOST_LDFLAGS $PTHREAD_LIBS"
+	CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"
+
+        AC_CACHE_CHECK(whether the boost::thread includes are available,
+                       ax_cv_boost_thread,
+        [AC_LANG_PUSH([C++])
+             AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[@%:@include <boost/thread/thread.hpp>]],
+                                   [[boost::thread_group thrds;
+                                   return 0;]]),
+                   ax_cv_boost_thread=yes, ax_cv_boost_thread=no)
+             AC_LANG_POP([C++])
+        ])
+
+        if test "$ax_cv_boost_thread" = "yes"; then
+	    BOOST_CXXFLAGS="$PTHREAD_CFLAGS"
+            AC_SUBST(BOOST_CXXFLAGS)
+	    _AX_BOOST_CHECK_LIB([boost_thread])
+	    if test "$link_ok" = "yes" && test -n "$PTHREAD_LIBS"; then
+	        BOOST_THREAD_LIB="$BOOST_THREAD_LIB $PTHREAD_LIBS"
+	    fi
+        fi
+
+        CPPFLAGS="$CPPFLAGS_SAVED"
+        LDFLAGS="$LDFLAGS_SAVED"
+	CXXFLAGS="$CXXFLAGS_SAVED"
+    fi
+])