How to define macro which correctly sets the __declspec - c++

Question

Using Visual Studio 2017, I am trying to build my latest project which imports libraries, which in turn import methods and functions from .dll files.
When building my project, I get a list of errors like this:
error LNK2001: unresolved external symbol "__declspec(dllimport) void __cdecl UserTracking(void *)" (__imp_?UserTracking##YAXPEAX#Z)
error LNK2001: unresolved external symbol "public: bool __cdecl EACServer::Destroy(void)const " (?Destroy#EACServer##QEBA_NXZ)
error LNK2001: unresolved external symbol "public: bool __cdecl EACServer::Initialize(void)const " (?Initialize#EACServer##QEBA_NXZ)
...
All of the functions listed are from imported libraries.
As an example, the EACServer::Initialize method is defined as so in EACServer.h:
bool Initialize() const;
In the code I am compiling, this function is used as so (the appropriate header files are imported in the .h file ofc):
this->eacServer = EACServer();
this->eacServer.Initialize();
The class definition of EACServer is basic:
class EACServer : IRoot {
...
}
I have been told that these errors are thrown because I am missing the macro which correctly sets the __declspec.
How can I find/implement this macro?

Answer 1

Turns out that although I added the paths to my libraries in the linker additional library directories, I had neglected to add the .lib files in the linker additional dependencies.