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#serial 7

dnl From Jim Meyering.
dnl A wrapper around AC_FUNC_MKTIME.

AC_DEFUN(jm_FUNC_MKTIME,
[AC_REQUIRE([AC_FUNC_MKTIME])dnl

 dnl mktime.c uses localtime_r if it exists.  Check for it.
 AC_CHECK_FUNCS(localtime_r)

 if test $ac_cv_func_working_mktime = no; then
   AC_DEFINE_UNQUOTED(mktime, rpl_mktime,
    [Define to rpl_mktime if the replacement function should be used.])
 fi
])

kc3-lang/gnulib/m4/jm-mktime.m4

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m4/jm-mktime.m4