This is what's new and changed in the c-ares 1.4.0 release:

 o fixed VS2005 compiler warnings due to time_t being 64bit
 o introduced cryptographically secure transaction IDs
 o added ares_save_options()
 o added ares_destroy_options()
 o added ares_process_fd()
 o fixed undefined return value in init_by_resolv_conf() function for windows
 o added ares_parse_ns_reply()
 o fix failure to get the search sequence of /etc/hosts and DNS from
   /etc/nsswitch.conf, /etc/host.conf or /etc/svc.conf when /etc/resolv.conf
   did not exist
 o when domains were sert in the options struct, and there were domain/search
   entries in /etc/resolv.conf, the domains of the options struct would be
   overridden
 o removed a couple of potential zero size memory allocations
 o fixed the line endings in areslib.dsp

Thanks go to these friendly people for their efforts and contributions:

 Andreas Rieke, Yang Tse, Michael Wallner, Vlad Dinulescu, Ravi Pratap,
 Brad House, Shmulik Regev, Brad Spencer

Have fun!