/usr/include/ns3.26/ns3/point-to-point-layout-module.h is in libns3-dev 3.26+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #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_POINT_TO_POINT_LAYOUT
// Module headers:
#include "point-to-point-dumbbell.h"
#include "point-to-point-grid.h"
#include "point-to-point-star.h"
#endif
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