CBaseEntity in a ServerPlugin?

[omnicoder]

Been trying all sorts of crazy stuff and pulling my hair out trying to get access to CBaseEntity in a serverplugin based off of serverplugin_empty for the past week. I added cbase.h, changed all the references of GameEventManager to GameEventManager2 etc, and although I have no errors before compiling/in design mode, I get a link error from my obj file that it cannot 'resolve external symbol' for every line where I use CBaseEntity. Same error happens for filesystem which is also from cbase.h. Is there something else I need in order to do this, or another way to access the filesystem and entity keyvalues?

[Shrinker]

I have no idea how the SDK looks like from file perspective, but it looks like either a static library reference (.lib, see project settings/linker/additional dependencies) or a cpp file is missing. Missing linker symbols usually indicate that the compiler saw the header declaration, but no implementation in code. On the other hand, you probably already know all of this.