AC_FUNC_VPRINTF
AC_CHECK_FUNCS([alarm atexit dup2 fdatasync ftruncate getcwd \
gethostbyaddr gethostbyname gethostname getmntent \
- getnameinfo getrpcbyname \
+ getnameinfo getrpcbyname getifaddrs \
gettimeofday hasmntopt inet_ntoa innetgr memset mkdir pathconf \
realpath rmdir select socket strcasecmp strchr strdup \
strerror strrchr strtol strtoul sigprocmask])