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/usr/include/ns3.26/ns3/csma-layout-module.h is in libns3-dev 3.26+dfsg-1.

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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_CSMA_LAYOUT
    

// Module headers:
#include "csma-star-helper.h"
#endif