Index: ntp-4.2.8p18/sntp/configure.ac
===================================================================
--- ntp-4.2.8p18.orig/sntp/configure.ac
+++ ntp-4.2.8p18/sntp/configure.ac
@@ -130,7 +130,7 @@ AC_DEFINE([HAVE_NO_NICE], 1, [sntp does
 AC_DEFINE([HAVE_TERMIOS], 1, [sntp does not care about TTY stuff])
 
 # Checks for library functions.
-AC_CHECK_FUNCS([socket])
+AC_CHECK_FUNCS([socket memchr strnlen])
 
 NTP_UNITYBUILD