+AC_SEARCH_LIBS(inet_ntoa, socket nsl)
+AC_SEARCH_LIBS(inet_addr, socket nsl)
+# AC_SEARCH_LIBS(gethostbyname, socket nsl resolv) # (if we used gethostbyname)
+
+AC_CHECK_FUNCS([ftruncate fdopendir lstat64 stat64 memchr munmap select socket strcasecmp strchr strcspn strerror strrchr strspn strtoul strtoull connect inet_ntoa inet_addr])