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diff --git a/gr-howto-write-a-block/config/onceonly.m4 b/gr-howto-write-a-block/config/onceonly.m4
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-# onceonly.m4 serial 3
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License. As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
-
-dnl This file defines some "once only" variants of standard autoconf macros.
-dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS
-dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS
-dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS
-dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC
-dnl The advantage is that the check for each of the headers/functions/decls
-dnl will be put only once into the 'configure' file. It keeps the size of
-dnl the 'configure' file down, and avoids redundant output when 'configure'
-dnl is run.
-dnl The drawback is that the checks cannot be conditionalized. If you write
-dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi
-dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to
-dnl empty, and the check will be inserted before the body of the AC_DEFUNed
-dnl function.
-
-dnl Autoconf version 2.57 or newer is recommended.
-AC_PREREQ(2.54)
-
-# AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
-# AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
-AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
- :
- AC_FOREACH([gl_HEADER_NAME], [$1], [
- AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(defn([gl_HEADER_NAME]),
- [-./], [___])), [
- AC_CHECK_HEADERS(gl_HEADER_NAME)
- ])
- AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME,
- [-./], [___])))
- ])
-])
-
-# AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of
-# AC_CHECK_FUNCS(FUNC1 FUNC2 ...).
-AC_DEFUN([AC_CHECK_FUNCS_ONCE], [
- :
- AC_FOREACH([gl_FUNC_NAME], [$1], [
- AC_DEFUN([gl_CHECK_FUNC_]defn([gl_FUNC_NAME]), [
- AC_CHECK_FUNCS(defn([gl_FUNC_NAME]))
- ])
- AC_REQUIRE([gl_CHECK_FUNC_]defn([gl_FUNC_NAME]))
- ])
-])
-
-# AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of
-# AC_CHECK_DECLS(DECL1, DECL2, ...).
-AC_DEFUN([AC_CHECK_DECLS_ONCE], [
- :
- AC_FOREACH([gl_DECL_NAME], [$1], [
- AC_DEFUN([gl_CHECK_DECL_]defn([gl_DECL_NAME]), [
- AC_CHECK_DECLS(defn([gl_DECL_NAME]))
- ])
- AC_REQUIRE([gl_CHECK_DECL_]defn([gl_DECL_NAME]))
- ])
-])