编译VPB0.9.12时出现这种错误：
49 error LNK2005: "public: void __thiscall std::basic_ofstream >::`vbase destructor'(void)" (??_D?$basic_ofstream@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined in SpatialProperties.obj D:\OSG\VPB\VirtualPlanetBuilder-0.9.12\build\src\vpb\osgDB.lib(osg80-osgDB.dll) vpb
50 error LNK2001: unresolved external symbol _VSIFree D:\OSG\VPB\VirtualPlanetBuilder-0.9.12\build\src\vpb\System.obj vpb
51 error LNK2001: unresolved external symbol _VSIFree D:\OSG\VPB\VirtualPlanetBuilder-0.9.12\build\src\vpb\TextureUtils.obj vpb
105 error LNK2019: unresolved external symbol _CPLStrdup referenced in function "public: class CPLStringList & __thiscall CPLStringList::InsertString(int,char const *)" (?InsertString@CPLStringList@@QAEAAV1@HPBD@Z) D:\OSG\VPB\VirtualPlanetBuilder-0.9.12\build\src\vpb\BuildOptions.obj vpb
怎么办，好多方法都试了没有用啊，急