Diff of /libupnpp/device/device.hxx [e758ab] .. [23d913]

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--- a/libupnpp/device/device.hxx
+++ b/libupnpp/device/device.hxx
@@ -22,6 +22,7 @@
 #include <pthread.h>
 #include <upnp/upnp.h>
 
+#include <functional>
 #include <unordered_map>
 #include <memory>
 #include <string>