# ===========================================================================# http://www.gnu.org/software/autoconf-archive/ax_require_defined.html# ===========================================================================## SYNOPSIS## AX_REQUIRE_DEFINED(MACRO)## DESCRIPTION## AX_REQUIRE_DEFINED is a simple helper for making sure other macros have# been defined and thus are available for use. This avoids random issues# where a macro isn't expanded. Instead the configure script emits a# non-fatal:## ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found## It's like AC_REQUIRE except it doesn't expand the required macro.## Here's an example:## AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])## LICENSE## Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org>## 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. This file is offered as-is, without any# warranty.#serial 1AC_DEFUN([AX_REQUIRE_DEFINED], [dnl m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])])dnl AX_REQUIRE_DEFINED
