# ===========================================================================

 #      https://www.gnu.org/software/autoconf-archive/ax_func_mkdir.html

 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_FUNC_MKDIR
 #
 # DESCRIPTION
 #
 #   Check whether mkdir() is mkdir or _mkdir, and whether it takes one or
 #   two arguments.
 #
 #   This macro can define HAVE_MKDIR, HAVE__MKDIR, and MKDIR_TAKES_ONE_ARG,
 #   which are expected to be used as follows:
 #
 #     #if HAVE_MKDIR
 #     #  if MKDIR_TAKES_ONE_ARG
 #          /* MinGW32 */
 #     #    define mkdir(a, b) mkdir(a)
 #     #  endif
 #     #else
 #     #  if HAVE__MKDIR
 #          /* plain Windows 32 */
 #     #    define mkdir(a, b) _mkdir(a)
 #     #  else
 #     #    error "Don't know how to create a directory on this system."
 #     #  endif
 #     #endif
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.org>
 #
 #   This program is free software; you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
 #   Free Software Foundation; either version 2 of the License, or (at your
 #   option) any later version.
 #
 #   This program is distributed in the hope that it will be useful, but
 #   WITHOUT ANY WARRANTY; without even the implied warranty of
 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along

 #   with this program. If not, see <https://www.gnu.org/licenses/>.

 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
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 #serial 6

 
 AU_ALIAS([AC_FUNC_MKDIR], [AX_FUNC_MKDIR])
 AC_DEFUN([AX_FUNC_MKDIR],
 [AC_CHECK_FUNCS([mkdir _mkdir])
 AC_CACHE_CHECK([whether mkdir takes one argument],
                [ac_cv_mkdir_takes_one_arg],

 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[

 #include <sys/stat.h>
 #if HAVE_UNISTD_H
 #  include <unistd.h>
 #endif

 ]], [[mkdir (".");]])],

 [ac_cv_mkdir_takes_one_arg=yes], [ac_cv_mkdir_takes_one_arg=no])])
 if test x"$ac_cv_mkdir_takes_one_arg" = xyes; then
   AC_DEFINE([MKDIR_TAKES_ONE_ARG], 1,
             [Define if mkdir takes only one argument.])
 fi
 ])
 
 dnl Note:
 dnl =====
 dnl I have not implemented the following suggestion because I don't have
 dnl access to such a broken environment to test the macro.  So I'm just
 dnl appending the comments here in case you have, and want to fix
 dnl AX_FUNC_MKDIR that way.
 dnl
 dnl |Thomas E. Dickey (dickey@herndon4.his.com) said:
 dnl |  it doesn't cover the problem areas (compilers that mistreat mkdir
 dnl |  may prototype it in dir.h and dirent.h, for instance).
 dnl |
 dnl |Alexandre:
 dnl |  Would it be sufficient to check for these headers and #include

 dnl |  them in the AC_COMPILE_IFELSE block?  (and is AC_HEADER_DIRENT

 dnl |  suitable for this?)
 dnl |
 dnl |Thomas:
 dnl |  I think that might be a good starting point (with the set of recommended
 dnl |  ifdef's and includes for AC_HEADER_DIRENT, of course).