ns3-gym build issue

[Alok Mathur]

Hi All, 

I am following https://apps.nsnam.org/app/ns3-gym/ to install ns3-gym.

But when i build ns3 . I am getting following error

Could anyone help what could be the fix for this?

Thanks

[Gabriel Ferreira]

Oh boy, this issue yet again. Problem is `I` is defined as a macro for the imaginary number in complex.h. 

When attribute container is parsed after `complex.h`, the template parameter `I` gets replaced with the imaginary number and breaks the template processing.
It can be solved by changing the template parameter name, or undefing I after including complex.h

#include <complex.h>

#undef I

[Gabriel Ferreira]

It seems this include can be commented out/removed (change landed on 3.37).
https://gitlab.com/nsnam/ns-3-dev/-/commit/3e205156640dcac194d95afa182ef8fd953a01db

[Smita Mahajan]

Hello Mr. Alok

Please try using python3, instead of python.

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Smita Mahajan

[Alok Mathur]

Thanks a lot. 

#undef I worked for me

[kaouthar ouali]

Thanks for the solution.