@@ -11,10 +11,12 @@
  * Alternatively, it may be distributed under the terms of the GNU General
  * Public License, either version 2 or 3, which can be found in the file
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
+
+#include <errno.h>
 
 #import "OFException.h"
 
 #ifndef OF_HAVE_SOCKETS
 # error No sockets available!