file not found occ.obj

I am trying to create an application using QT5 and use OpenCASCADE in my applicatio. When i am trying to include OCC file i am getting an error "file not found occ.obj" or "occ.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall Standard_OutOfMemory::Standard_OutOfMemory(char const * const)" (??0Standard_OutOfMemory@@QAE@QBD@Z) referenced in function "public: void __thiscall Standard_OutOfMemory::`default constructor closure'(void)" (??_FStandard_OutOfMemory@@QAEXXZ)"


Any one knows the solution please let me know