Unresolved External Symbols MSVC 2010/13 Compilation

[dridley191]

Error 35 error LNK2019: unresolved external symbol "public: class SGPropertyNode * thiscall simgear::PropertyObjectBase::node(bool)const " (?node@PropertyObjectBase@simgear@@QBEPAVSGPropertyNode@@_N@Z) referenced in function "public: bool __thiscall simgear::PropertyObject::operator=(bool const &)" (??4?$PropertyObject@_N@simgear@@QAE_NAB_N@Z) F:\Development\195\New folder\JSBSim\JSBSim\FGPropulsion.obj Error 31 error LNK2019: unresolved external symbol "public: class SGPropertyNode * thiscall simgear::PropertyObjectBase::getOrThrow(void)const " (?getOrThrow@PropertyObjectBase@simgear@@QBEPAVSGPropertyNode@@XZ) referenced in function "public: thiscall simgear::PropertyObject::operator double(void)const " (??B?$PropertyObject@N@simgear@@QBENXZ) F:\Development\195\New folder\JSBSim\JSBSim\FGWaypoint.obj Error 29 error LNK2019: unresolved external symbol "public: thiscall simgear::PropertyObjectBase::PropertyObjectBase(void)" (??0PropertyObjectBase@simgear@@QAE@XZ) referenced in function "public: thiscall simgear::PropertyObject::PropertyObject(void)" (??0?$PropertyObject@N@simgear@@QAE@XZ) F:\Development\195\New folder\JSBSim\JSBSim\FGWaypoint.obj Error 33 error LNK2019: unresolved external symbol "public: thiscall simgear::PropertyObjectBase::PropertyObjectBase(class SGPropertyNode ,char const )" (??0PropertyObjectBase@simgear@@QAE@PAVSGPropertyNode@@PBD@Z) referenced in function "public: thiscall simgear::PropertyObject::PropertyObject(class SGPropertyNode ,char const )" (??0?$PropertyObject@N@simgear@@QAE@PAVSGPropertyNode@@PBD@Z) F:\Development\195\New folder\JSBSim\JSBSim\FGWaypoint.obj Error 32 error LNK2001: unresolved external symbol "public: class SGPropertyNode * thiscall simgear::PropertyObjectBase::getOrThrow(void)const " (?getOrThrow@PropertyObjectBase@simgear@@QBEPAVSGPropertyNode@@XZ) F:\Development\195\New folder\JSBSim\JSBSim\FGPropulsion.obj Error 30 error LNK2001: unresolved external symbol "public: thiscall simgear::PropertyObjectBase::PropertyObjectBase(void)" (??0PropertyObjectBase@simgear@@QAE@XZ) F:\Development\195\New folder\JSBSim\JSBSim\FGPropulsion.obj Error 34 error LNK2001: unresolved external symbol "public: thiscall simgear::PropertyObjectBase::PropertyObjectBase(class SGPropertyNode ,char const )" (??0PropertyObjectBase@simgear@@QAE@PAVSGPropertyNode@@PBD@Z) F:\Development\195\New folder\JSBSim\JSBSim\FGPropulsion.obj Error 36 error LNK1120: 4 unresolved externals F:\Development\195\New folder\JSBSim\JSBSim\Debug\JSBSim.exe