- Fixed a few variable return types for some system calls. Made configure

check for ssize_t to make it possible to use that when receiving the send()
  error code. This is necessary to prevent compiler warnings on some systems.

- Made configure create config.h, and all source files now include setup.h that
  might include the proper config.h (or a handicrafted alternative).

- Switched to 'ares_socket_t' type for sockets in ares, since Windows don't
  use 'int' for that.

- automake-ified and libool-ified c-ares. Now it builds libcares as a shared
  lib on most platforms if wanted. (This bloated the size of the release
  archive with another 200K!)

- Makefile.am now uses Makefile.inc for the c sources, h headers and man
  pages, to make it easier for other makefiles to use the exact same set of
  files.

- Adjusted 'maketgz' to use the new automake magic when building distribution
  archives.

ares__close_sockets.c

@@ -13,6 +13,8 @@
  * without express or implied warranty.
  */
 
+#include "setup.h"
+
 #include <stdlib.h>
 #ifdef WIN32
 #else
@@ -42,14 +44,14 @@ void ares__close_sockets(struct server_state *server)
   server->tcp_lenbuf_pos = 0;
 
   /* Close the TCP and UDP sockets. */
-  if (server->tcp_socket != -1)
+  if (server->tcp_socket != ARES_SOCKET_BAD)
     {
       closesocket(server->tcp_socket);
-      server->tcp_socket = -1;
+      server->tcp_socket = ARES_SOCKET_BAD;
     }
-  if (server->udp_socket != -1)
+  if (server->udp_socket != ARES_SOCKET_BAD)
     {
       closesocket(server->udp_socket);
-      server->udp_socket = -1;
+      server->udp_socket = ARES_SOCKET_BAD;
     }
 }