C++项目无法编译，求助

[ChrisPei]

RecastDemo已经可以正常编译了。但是到NavigatorForUnity无法编译。
如下：

Navigator.cpp
NavigatorForUnity.cpp
Generating Code...
dllmain.cpp
Creating library C:\Users\Chris\Documents\Worktable\github\Navigator\recastnavigation\RecastDemo\Build\vs2015\Debug\NavigatorForUnity.lib and object C:\Users\Chris\Documents\Worktable\github\Navigator\recastnavigation\RecastDemo\Build\vs2015\Debug\NavigatorForUnity.exp
Navigator.obj : error LNK2019: unresolved external symbol "struct rcPolyMesh * __cdecl rcAllocPolyMesh(void)" (?rcAllocPolyMesh@@YAPAUrcPolyMesh@@xz) referenced in function "public: static int __cdecl Navigator::ConvertJsonToNavBinFile(char const *,char const *)" (?ConvertJsonToNavBinFile@Navigator@@SAHPBD0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "void * __cdecl dtAlloc(unsigned int,enum dtAllocHint)" (?dtAlloc@@YAPAXIW4dtAllocHint@@@z) referenced in function "public: static class dtNavMesh * __cdecl Navigator::LoadNavMesh(char const *)" (?LoadNavMesh@Navigator@@SAPAVdtNavMesh@@pbd@Z)
Navigator.obj : error LNK2019: unresolved external symbol "void __cdecl dtFree(void *)" (?dtFree@@YAXPAX@Z) referenced in function "public: static int __cdecl Navigator::ConvertJsonToNavBinFile(char const *,char const *)" (?ConvertJsonToNavBinFile@Navigator@@SAHPBD0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMesh::init(struct dtNavMeshParams const *)" (?init@dtNavMesh@@QAEIPBUdtNavMeshParams@@@z) referenced in function "public: static class dtNavMesh * __cdecl Navigator::LoadNavMesh(char const *)" (?LoadNavMesh@Navigator@@SAPAVdtNavMesh@@pbd@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMesh::init(unsigned char *,int,int)" (?init@dtNavMesh@@QAEIPAEHH@Z) referenced in function "public: static int __cdecl Navigator::ConvertJsonToNavBinFile(char const *,char const *)" (?ConvertJsonToNavBinFile@Navigator@@SAHPBD0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: struct dtNavMeshParams const * __thiscall dtNavMesh::getParams(void)const " (?getParams@dtNavMesh@@QBEPBUdtNavMeshParams@@xz) referenced in function "public: static void __cdecl Navigator::SaveNavMesh(char const *,class dtNavMesh const *)" (?SaveNavMesh@Navigator@@SAXPBDPBVdtNavMesh@@@z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMesh::addTile(unsigned char *,int,int,unsigned int,unsigned int *)" (?addTile@dtNavMesh@@QAEIPAEHHIPAI@Z) referenced in function "public: static class dtNavMesh * __cdecl Navigator::LoadNavMesh(char const *)" (?LoadNavMesh@Navigator@@SAPAVdtNavMesh@@pbd@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMesh::getTileRef(struct dtMeshTile const *)const " (?getTileRef@dtNavMesh@@QBEIPBUdtMeshTile@@@z) referenced in function "public: static void __cdecl Navigator::SaveNavMesh(char const *,class dtNavMesh const *)" (?SaveNavMesh@Navigator@@SAXPBDPBVdtNavMesh@@@z)
Navigator.obj : error LNK2019: unresolved external symbol "public: int __thiscall dtNavMesh::getMaxTiles(void)const " (?getMaxTiles@dtNavMesh@@QBEHXZ) referenced in function "public: static void __cdecl Navigator::SaveNavMesh(char const *,class dtNavMesh const *)" (?SaveNavMesh@Navigator@@SAXPBDPBVdtNavMesh@@@z)
Navigator.obj : error LNK2019: unresolved external symbol "public: struct dtMeshTile const * __thiscall dtNavMesh::getTile(int)const " (?getTile@dtNavMesh@@QBEPBUdtMeshTile@@h@Z) referenced in function "public: static void __cdecl Navigator::SaveNavMesh(char const *,class dtNavMesh const *)" (?SaveNavMesh@Navigator@@SAXPBDPBVdtNavMesh@@@z)
Navigator.obj : error LNK2019: unresolved external symbol "class dtNavMesh * __cdecl dtAllocNavMesh(void)" (?dtAllocNavMesh@@YAPAVdtNavMesh@@xz) referenced in function "public: static int __cdecl Navigator::ConvertJsonToNavBinFile(char const *,char const *)" (?ConvertJsonToNavBinFile@Navigator@@SAHPBD0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "void __cdecl dtFreeNavMesh(class dtNavMesh *)" (?dtFreeNavMesh@@YAXPAVdtNavMesh@@@z) referenced in function "public: virtual __thiscall Navigator::~Navigator(void)" (??1Navigator@@UAE@XZ)
Navigator.obj : error LNK2019: unresolved external symbol "public: __thiscall dtQueryFilter::dtQueryFilter(void)" (??0dtQueryFilter@@QAE@XZ) referenced in function "public: int __thiscall Navigator::findRandomPointAroundCircle(float *,float,float *)" (?findRandomPointAroundCircle@Navigator@@QAEHPAMM0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMeshQuery::init(class dtNavMesh const *,int)" (?init@dtNavMeshQuery@@QAEIPBVdtNavMesh@@h@Z) referenced in function "public: int __thiscall Navigator::init(char const *)" (?init@Navigator@@QAEHPBD@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMeshQuery::findNearestPoly(float const *,float const *,class dtQueryFilter const *,unsigned int *,float *)const " (?findNearestPoly@dtNavMeshQuery@@QBEIPBM0PBVdtQueryFilter@@PAIPAM@Z) referenced in function "public: int __thiscall Navigator::findRandomPointAroundCircle(float *,float,float *)" (?findRandomPointAroundCircle@Navigator@@QAEHPAMM0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall dtNavMeshQuery::findRandomPointAroundCircle(unsigned int,float const *,float,class dtQueryFilter const ,float (__cdecl)(void),unsigned int *,float *)const " (?findRandomPointAroundCircle@dtNavMeshQuery@@QBEIIPBMMPBVdtQueryFilter@@P6AMXZPAIPAM@Z) referenced in function "public: int __thiscall Navigator::findRandomPointAroundCircle(float *,float,float *)" (?findRandomPointAroundCircle@Navigator@@QAEHPAMM0@Z)
Navigator.obj : error LNK2019: unresolved external symbol "class dtNavMeshQuery * __cdecl dtAllocNavMeshQuery(void)" (?dtAllocNavMeshQuery@@YAPAVdtNavMeshQuery@@xz) referenced in function "public: int __thiscall Navigator::init(char const *)" (?init@Navigator@@QAEHPBD@Z)
Navigator.obj : error LNK2019: unresolved external symbol "void __cdecl dtFreeNavMeshQuery(class dtNavMeshQuery *)" (?dtFreeNavMeshQuery@@YAXPAVdtNavMeshQuery@@@z) referenced in function "public: virtual __thiscall Navigator::~Navigator(void)" (??1Navigator@@UAE@XZ)
Navigator.obj : error LNK2019: unresolved external symbol "bool __cdecl dtCreateNavMeshData(struct dtNavMeshCreateParams *,unsigned char * *,int *)" (?dtCreateNavMeshData@@YA_NPAUdtNavMeshCreateParams@@PAPAEPAH@Z) referenced in function "public: static int __cdecl Navigator::ConvertJsonToNavBinFile(char const *,char const *)" (?ConvertJsonToNavBinFile@Navigator@@SAHPBD0@Z)
C:\Users\Chris\Documents\Worktable\github\Navigator\recastnavigation\RecastDemo\Build\vs2015\Debug\NavigatorForUnity.dll : fatal error LNK1120: 19 unresolved externals

不是太懂c++，真心求助。