#serial 5dnl From Paul Eggert.# Define ST_MTIM_NSEC to be the nanoseconds member of struct stat's st_mtim,# if it exists.AC_DEFUN([AC_STRUCT_ST_MTIM_NSEC], [AC_CACHE_CHECK([for nanoseconds member of struct stat.st_mtim],   ac_cv_struct_st_mtim_nsec,   [ac_save_CPPFLAGS="$CPPFLAGS"    ac_cv_struct_st_mtim_nsec=no    # tv_nsec -- the usual case    # _tv_nsec -- Solaris 2.6, if    #	(defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1    #	 && !defined __EXTENSIONS__)    # st__tim.tv_nsec -- UnixWare 2.1.2    for ac_val in tv_nsec _tv_nsec st__tim.tv_nsec; do      CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"      AC_TRY_COMPILE([#include <sys/types.h>#include <sys/stat.h>], [struct stat s; s.st_mtim.ST_MTIM_NSEC;],        [ac_cv_struct_st_mtim_nsec=$ac_val; break])    done    CPPFLAGS="$ac_save_CPPFLAGS"])  if test $ac_cv_struct_st_mtim_nsec != no; then    AC_DEFINE_UNQUOTED(ST_MTIM_NSEC, $ac_cv_struct_st_mtim_nsec,      [Define to be the nanoseconds member of struct stat's st_mtim,   if it exists.])  fi ])