akio@ubuntu ~
❯ make -j$(nproc)
g++ -std=c++2b -g -Iinclude -MMD -MP -Iinclude -x c++-header include/pch.hpp -o build/pch.gch
include/pch.hpp:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
g++ -std=c++2b -g -Iinclude -MMD -MP -c main.cpp -o build/main.o
g++ -std=c++2b -g -Iinclude -MMD -MP -c include/action/__action.cpp -o build/include/action/__action.o
g++ -std=c++2b -g -Iinclude -MMD -MP -c include/action/buy.cpp -o build/include/action/buy.o
g++ -std=c++2b -g -Iinclude -MMD -MP -c include/action/dialog_return.cpp -o build/include/action/dialog_return.o
include/action/buy.cpp: In function ‘void action::buy(ENetEvent&, const string&, std::string_view)’:
include/action/buy.cpp:39:22: error: ‘format’ is not a member of ‘std’
   39 |                 std::format(
      |                      ^~~~~~
include/action/buy.cpp:45:18: error: ‘format’ is not a member of ‘std’
   45 |             std::format(
      |                  ^~~~~~
include/action/buy.cpp:62:42: error: ‘format’ is not a member of ‘std’
   62 |                 StoreRequest.append(std::format(
      |                                          ^~~~~~
include/action/buy.cpp:68:58: error: ‘format’ is not a member of ‘std’
   68 |         if (!selection.empty()) StoreRequest.append(std::format("select_item|{}\\n", selection));
      |                                                          ^~~~~~
include/action/buy.cpp:87:30: error: ‘format’ is not a member of ‘std’
   87 |                         std::format("You can't afford `0{}``!  You're `${}`` Gems short.",
      |                              ^~~~~~
include/action/buy.cpp:89:30: error: ‘format’ is not a member of ‘std’
   89 |                         std::format("You can't afford `0{}``!  You're `${}`` `2Growtokens`` short.",
      |                              ^~~~~~

gcc --version
g++ --version

# add gcc repository
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt update

# install gcc 13
sudo apt install gcc-13 g++-13

# set gcc 13 as default
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 130
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-13 130
sudo update-alternatives --config gcc
sudo update-alternatives --config g++

# verify
gcc --version
g++ --version

# Homebrew
brew install gcc

# MacPorts
sudo port install gcc15