Build fix.
diff --git a/AmigaCatalog.cpp b/AmigaCatalog.cpp
index ce5ce77..cd056a0 100644
--- a/AmigaCatalog.cpp
+++ b/AmigaCatalog.cpp
@@ -1,5 +1,5 @@
 /*
-** Copyright 2009-2015 Adrien Destugues, pulkomandy@pulkomandy.tk.
+** Copyright 2009-2019 Adrien Destugues, pulkomandy@pulkomandy.tk.
 ** Distributed under the terms of the MIT License.
 */
 
@@ -9,6 +9,8 @@
 #include <memory>
 #include <new>
 
+#include <arpa/inet.h>
+
 #include <Application.h>
 #include <Directory.h>
 #include <File.h>