+
+dnl We have fallbacks in case these are missing, so just check for them.
+AC_CHECK_FUNCS(freeaddrinfo getaddrinfo getnameinfo getpagesize memcpy memset strdup strerror strsignal localtime_r setrlimit getopt getopt_long regcomp regexec regfree sysconf inet_aton epoll_create select gettimeofday,,)
+
+dnl Check for the fallbacks for functions missing above.