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diff --git a/gr-howto-write-a-block/config/lf_cxx.m4 b/gr-howto-write-a-block/config/lf_cxx.m4
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+dnl Autoconf support for C++
+dnl Copyright (C) 1988 Eleftherios Gkioulekas <lf@amath.washington.edu>
+dnl  
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3 of the License, or
+dnl (at your option) any later version.
+dnl 
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software 
+dnl Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301, USA.
+dnl 
+dnl As a special exception to the GNU General Public License, if you 
+dnl distribute this file as part of a program that contains a configuration 
+dnl script generated by Autoconf, you may include it under the same 
+dnl distribution terms that you use for the rest of that program.
+
+# -----------------------------------------------------------------
+# This macro should be called to configure your C++ compiler.
+# When called, the macro does the following things:
+# 1. It finds an appropriate C++ compiler
+#    If you passed the flag --with-cxx=foo, then it uses that
+#    particular compiler
+# 2. Checks whether the compiler accepts the -g 
+# ------------------------------------------------------------------
+
+AC_DEFUN([LF_CONFIGURE_CXX],[
+ AC_REQUIRE([AC_PROG_CXX])dnl
+ AC_REQUIRE([AC_PROG_CXXCPP])dnl
+ LF_CXX_PORTABILITY
+])
+
+# -----------------------------------------------------------------------
+# This macro tests the C++ compiler for various portability problem.
+# -----------------------------------------------------------------------
+
+
+AC_DEFUN([LF_CXX_PORTABILITY],[
+
+  dnl
+  dnl Check for common C++ portability problems
+  dnl
+
+  dnl AC_LANG_PUSH
+  dnl AC_LANG_CPLUSPLUS
+  AC_LANG_SAVE
+  AC_LANG_CPLUSPLUS
+
+
+  dnl Test whether C++ has std::isnan
+  AC_MSG_CHECKING(whether C++ has std::isnan)
+  AC_TRY_COMPILE([#include <cmath>], [
+   std::isnan(0);
+], [ AC_MSG_RESULT(yes)
+	AC_DEFINE(CXX_HAS_STD_ISNAN,[],[Define if has std::isnan]) ],
+   [ AC_MSG_RESULT(no) ])
+
+  dnl Done with the portability checks
+  dnl AC_LANG_POP([C++])
+  AC_LANG_RESTORE
+])
+