AC_CHECK_HEADERS(maillock.h)
AC_CHECK_FUNCS(gethostname getdomainname dup2 \
-rename closedir mkdir rmdir sysinfo \
+rename closedir mkdir rmdir sysinfo getrusage \
random lrand48 bcopy bcmp logb frexp fmod rint cbrt ftime res_init setsid \
strerror fpathconf select mktime euidaccess getpagesize tzset setlocale \
utimes setrlimit setpgid getcwd getwd shutdown getaddrinfo \