the EXP in this case is an IFDEF-ed Symbol for Win32-Platform depending on the Symbol _LIBRYZENADJ_INTERNAL
#define EXP __declspec(dllexport) if _LIBRYZENADJ_INTERNAL is defined, otherwise --declspec(dllimport)
For Non-Windows it depends on the Symbol _LIBRYZENADJ_INTERNAL
If Yes, then EXP = __attribte__((visibility("default"))), if No then it's empty
CALL the same: __stdcall for Windows otherwise empty