AC_CHECK_FUNCS(fcntl)
AC_REPLACE_FUNCS([asprintf atof atoll gmtime_r lldiv localtime_r rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtoll vasprintf swab])
AC_CHECK_FUNCS([stricmp strnicmp])
+AC_CHECK_FUNCS(fdatasync,,
+ [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
+])
dnl Check for Linux system calls
AC_CHECK_FUNCS([vmsplice])