OSX: fix setsockopt compile bug

util.c

@@ -26,6 +26,7 @@
 #include <sys/types.h>
 #ifndef WIN32
 # include <sys/socket.h>
+# include <netinet/in.h>
 # include <netinet/tcp.h>
 #else
 # include <winsock2.h>
@@ -262,6 +263,8 @@ int json_rpc_call_sockopt_cb(void *userdata, curl_socket_t fd, curlsocktype purp
 	if (unlikely(setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof(keepalive))))
 		return 1;
 
+# ifndef __APPLE_CC__
+
 	if (unlikely(setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &tcp_keepcnt, sizeof(tcp_keepcnt))))
 		return 1;
 
@@ -271,6 +274,13 @@ int json_rpc_call_sockopt_cb(void *userdata, curl_socket_t fd, curlsocktype purp
 	if (unlikely(setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &tcp_keepintvl, sizeof(tcp_keepintvl))))
 		return 1;
 
+# else
+
+	if (unlikely(setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &tcp_keepintvl, sizeof(tcp_keepintvl))))
+		return 1;
+
+# endif
+		
 #else
 	
 	struct tcp_keepalive vals;