dnl From Jim Meyering.
dnl FIXME: this should migrate into libit.

AC_DEFUN(AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
 AC_CHECK_HEADERS(sys/time.h)
 AC_CACHE_CHECK([for working mktime], am_cv_func_working_mktime,
  [AC_TRY_RUN([/* Test program from Tony Leneis (tony@plaza.ds.adp.com).  */
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
int
main ()
{
  time_t today = time (0);
  struct tm *local = localtime (&today);
  exit (mktime (local) != today);
}
	      ],
	     am_cv_func_working_mktime=yes, am_cv_func_working_mktime=no,
	     dnl When crosscompiling, assume mktime is missing or broken.
	     am_cv_func_working_mktime=no)
  ])
  if test $am_cv_func_working_mktime = no; then
    LIBOBJS="$LIBOBJS mktime.o"
  fi
])