About PA4 GCC Environment

[ByungwooChoi]

My environment is MacOS and used clang. But I got feedback that my code can not be compiled with GCC.
Until PA3, I use docker for test my code with GCC. But there are no routing case for docker container.
so I tried to use UTM to operate Ubuntu 22.04 with GCC. Then I got this build error.
How can I fix it? or Can you provide another docker img?