--- libtorrent-0.13.8/src/torrent/net/socket_address_key.h.orig	2020-05-24 23:46:13.061817408 +0000
+++ libtorrent-0.13.8/src/torrent/net/socket_address_key.h	2020-05-24 23:46:50.283152580 +0000
@@ -6,6 +6,9 @@
 
 #include <cstring>
 #include <inttypes.h>
+#if defined(__sun)
+#include <sys/socket.h>
+#endif
 #include <netinet/in.h>
 
 // Unique key for the socket address, excluding port numbers, etc.