linking problem of .obj files in matlab

Hi everyone,
I have a problem with linking of .obj files created by the command
>> mex -c *.cpp
This command succesfully compiles all cpp and header files in my working directory. However when I try to link them with the command
>> mex -v main.cpp
I get the following error report:
-> Default options filename found in C:\Documents and Settings\cihan\Application Data\MathWorks\MATLAB\R2006b
----------------------------------------------------------------
-> Options file = C:\Documents and Settings\cihan\Application Data\MathWorks\MATLAB\R2006b\mexopts.bat
MATLAB = C:\PROGRA~1\MATLAB\R2006b
-> COMPILER = cl
-> Compiler flags:
COMPFLAGS = -c -Zp8 -G5 -GR -W3 -DMATLAB_MEX_FILE -nologo
OPTIMFLAGS = /MD -O2 -Oy- -DNDEBUG
DEBUGFLAGS = /MD -Zi -Fd"main.mexw32.pdb"
arguments =
Name switch = /Fo
-> Pre-linking commands =
-> LINKER = link
-> Link directives:
LINKFLAGS = /dll /export:mexFunction /MAP /LIBPATH:"C:\PROGRA~1\MATLAB\R2006b\extern\lib\win32\microsoft" libmx.lib libmex.lib libmat.lib /implib:C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\templib.x /MACHINE:X86 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib
LINKDEBUGFLAGS = /DEBUG /PDB:"main.mexw32.pdb"
LINKFLAGSPOST =
Name directive = /out:"main.mexw32"
File link directive =
Lib. link directive =
Rsp file indicator = @
-> Resource Compiler = rc /fo "mexversion.res"
-> Resource Linker =
----------------------------------------------------------------


--> "cl -c -Zp8 -G5 -GR -W3 -DMATLAB_MEX_FILE -nologo /FoC:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\main.obj -IC:\PROGRA~1\MATLAB\R2006b\extern\include -IC:\PROGRA~1\MATLAB\R2006b\simulink\include /MD -O2 -Oy- -DNDEBUG -DMX_COMPAT_32 main.cpp"

main.cpp
Contents of C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\mex_tmp.rsp:
C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\main.obj


--> "link /out:"main.mexw32" /dll /export:mexFunction /MAP /LIBPATH:"C:\PROGRA~1\MATLAB\R2006b\extern\lib\win32\microsoft" libmx.lib libmex.lib libmat.lib /implib:C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\templib.x /MACHINE:X86 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib @C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\mex_tmp.rsp "

Microsoft (R) Incremental Linker Version 7.10.3077
Copyright (C) Microsoft Corporation. All rights reserved.

C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\main.obj
Creating library C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\templib.x and object C:\DOCUME~1\cihan\LOCALS~1\Temp\mex_26FE4922-4E1A-4465-75B7-D4A97DB04E6A\templib.exp
main.obj : error LNK2019: unresolved external symbol "public: __thiscall PQP_Model::~PQP_Model(void)" (??1PQP_Model@@QAE@XZ) referenced in function "public: void * __thiscall PQP_Model::`scalar deleting destructor'(unsigned int)" (??_GPQP_Model@@QAEPAXI@Z)
main.obj : error LNK2019: unresolved external symbol "public: __thiscall PQP_CollideResult::~PQP_CollideResult(void)" (??1PQP_CollideResult@@QAE@XZ) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "int __cdecl PQP_Tolerance(struct PQP_ToleranceResult *,double (* const)[3],double * const,class PQP_Model *,double (* const)[3],double * const,class PQP_Model *,double,int)" (?PQP_Tolerance@@YAHPAUPQP_ToleranceResult@@QAY02NQANPAVPQP_Model@@123NH@Z) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "int __cdecl PQP_Distance(struct PQP_DistanceResult *,double (* const)[3],double * const,class PQP_Model *,double (* const)[3],double * const,class PQP_Model *,double,double,int)" (?PQP_Distance@@YAHPAUPQP_DistanceResult@@QAY02NQANPAVPQP_Model@@123NNH@Z) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "int __cdecl PQP_Collide(struct PQP_CollideResult *,double (* const)[3],double * const,class PQP_Model *,double (* const)[3],double * const,class PQP_Model *,int)" (?PQP_Collide@@YAHPAUPQP_CollideResult@@QAY02NQANPAVPQP_Model@@123H@Z) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "public: __thiscall PQP_CollideResult:QP_CollideResult(void)" (??0PQP_CollideResult@@QAE@XZ) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "public: int __thiscall PQP_Model::MemUsage(int)" (?MemUsage@PQP_Model@@QAEHH@Z) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "public: int __thiscall PQP_Model::EndModel(void)" (?EndModel@PQP_Model@@QAEHXZ) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "public: int __thiscall PQP_Model::AddTri(double const *,double const *,double const *,int)" (?AddTri@PQP_Model@@QAEHPBN00H@Z) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "public: int __thiscall PQP_Model::BeginModel(int)" (?BeginModel@PQP_Model@@QAEHH@Z) referenced in function _mexFunction
main.obj : error LNK2019: unresolved external symbol "public: __thiscall PQP_Model:QP_Model(void)" (??0PQP_Model@@QAE@XZ) referenced in function _mexFunction
main.mexw32 : fatal error LNK1120: 11 unresolved externals

C:\PROGRA~1\MATLAB\R2006B\BIN\MEX.PL: Error: Link of 'main.mexw32' failed.

??? Error using ==> mex
Unable to complete successfully.

I am using Microsoft 7.1 compiler and Matlab 7.3. I am able to succesfully build, link and execute any mex examples under \extern\examples\mex directory.
Does anyone observe any solution to my problem?