File: ax_require_defined.m4

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# ===========================================================================
#    https://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 2

AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
  m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
])dnl AX_REQUIRE_DEFINED