include <sys/socket.h> to compile the fd_set stuff properly on all systems

lib/multi.c

@@ -24,6 +24,11 @@
 #include "setup.h"
 #include <stdlib.h>
 #include <string.h>
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
 #include <curl/curl.h>
 
 #include "urldata.h"

lib/ssluse.c

@@ -30,6 +30,9 @@
 
 #include <string.h>
 #include <stdlib.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
 
 #include "urldata.h"
 #include "sendf.h"