I can't find ns3/sgi-hashmap.h in the model of satellite-network

[liang-man]

I can't find the following header file. Where can I download it?
ns3/sgi-hashmap.h

Compilation error:
In file included from ../src/satellite-network/model/gsl-net-device.cc:36:0:
../src/satellite-network/model/gsl-channel.h:30:10: fatal error: ns3/sgi-hashmap.h: there is no such file or directory
#include "ns3/sgi-hashmap.h"
^~~~~~~~~~~~~~~~~~~
compilation terminated.

Thank you in advance!