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/usr/include/ns3.17/ns3/virtual-net-device-module.h is in libns3-dev 3.17+dfsg-1build1.

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#ifdef NS3_MODULE_COMPILATION
# error "Do not include ns3 module aggregator headers from other modules; these are meant only for end user scripts."
#endif

#ifndef NS3_MODULE_VIRTUAL_NET_DEVICE
    

// Module headers:
#include "virtual-net-device.h"
#endif