--- IO-AIO/configure.ac	2018/08/12 05:21:35	1.6
+++ IO-AIO/configure.ac	2018/08/12 06:03:20	1.7
@@ -156,5 +156,7 @@
 ]])],ac_cv_xtimespec=yes,ac_cv_xtimespec=no)])
 test $ac_cv_xtimespec = yes && AC_DEFINE(HAVE_ST_XTIMESPEC, 1, stat nanosecond access by st_xtimespec)
 
+# apparently, True64 uses st_u[amc]time, aix uses at_[amc]time_n and apple uses st_[amc,birth]timespec?
+
 AC_OUTPUT