Build darknet_server error

[duckzhao]

I refer to this document to reproduce the code<darknet_server>, everything went smoothly in the beginning,but when I execute to here, an error is generated.

The error message is as follows:

I have tried many methods, but none of them can solve the problem,I sincerely hope you can help me!

[duckzhao]

Maybe it's because of the GCC version，Could you tell me the GCC version you use?
I am now using Ubuntu 18.04 gcc7.5.0，and my opencv version is 4.2.0

[duatpham]

I also use this version but still have the error. Please help me

[pedrocavalc]

did you manage to fix the error?