From Empires Wiki
How to get your code to compile on the gitlab runners.
- Make sure your .cpp file contains #include "cbase.h" before any other includes
- Make sure the last include is #include "tier0/memdbgon.h"
- Repeat this for all the cpp files you want to add :P before proceeding...
- Ensure your files are in an appropriate directory. e.g. ...\src\game\server\empires\my_cpp_file.cpp
- Make an entry in the server_hl2mp.vpc file for your file e.g. $File "empires\my_cpp_file.cpp"