mkdtemp() and HAVE_MKDIR

Hello,

in the mkdtemp() implementation we have:

   for (;;)
     {
#if !defined _ELIX_LEVEL || _ELIX_LEVEL >= 4
       if (domkdir)
	{
#ifdef HAVE_MKDIR
	  if (_mkdir_r (ptr, path, 0700) == 0)
	    return 1;
	  if (_REENT_ERRNO(ptr) != EEXIST)
	    return 0;
#else /* !HAVE_MKDIR */
	  _REENT_ERRNO(ptr) = ENOSYS;
	  return 0;
#endif /* !HAVE_MKDIR */
	}
       else
#endif /* _ELIX_LEVEL */

The HAVE_MKDIR was added by:

commit 12387ab6f77d6ae4fa3d8fdc1756d416a27197dd
Author: Jeff Johnston <[email protected]>
Date:   Wed Aug 12 18:22:38 2009 +0000

     2009=08-12  Jeff Johnston  <[email protected]>

             * libc/stdio/mktemp.c (_gettemp): Do not call _mkdir_r unless
             HAVE_MKDIR is defined.

Do we really need this check since Newlib provides an mkdir() 
implementation? How should a system set the HAVE_MKDIR define?

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