AC_CACHE_CHECK(for timezone variable, ac_cv_var_timezone,
        AC_TRY_COMPILE([
                #include <time.h>
        ], [
                timezone = 1;
        ], ac_cv_var_timezone=yes, ac_cv_var_timezone=no))
if test $ac_cv_var_timezone = yes; then
        AC_DEFINE(HAVE_TIMEZONE, 1, [define if you have a timezone variable])
fi
AC_CACHE_CHECK(for tm_gmtoff in struct tm, ac_cv_struct_tm_gmtoff,
        AC_TRY_COMPILE([
                #include <time.h>
        ], [
                struct tm tm;
                tm.tm_gmtoff = 1;
        ], ac_cv_struct_tm_gmtoff=yes, ac_cv_struct_tm_gmtoff=no))
if test $ac_cv_struct_tm_gmtoff = yes; then
        AC_DEFINE(HAVE_TM_GMTOFF, 1, [Define if you have a tm_gmtoff member in struct tm])
fi


AC_CHECK_FUNCS(memrchr)
AC_CHECK_FUNCS(putc_unlocked)