AC_CHECK_FUNCS(strdup strstr strcasecmp strncasecmp strpbrk memmove)
AC_CHECK_FUNCS(gettimeofday mktime strptime strerror snprintf vsnprintf)
AC_CHECK_FUNCS(select sigblock sigsetjmp signal symlink access isatty)
-AC_CHECK_FUNCS(uname gethostname usleep)
+AC_CHECK_FUNCS(uname gethostname nanosleep usleep)
dnl
dnl Check if we need to compile in getopt.c.