help with postgresql dll

Hi to everybody

sorry for my english, it is not so good .....

I try to write a program with VC++ that use pq++.dll
but the linker give me this error

LIBCD.lib(dbgheap.obj) : error LNK2005: _free already defined in pq++.lib(pq++.dll)
dbpostgres.obj : error LNK2001: unresolved external symbol "public: int __thiscall PgConnection::ConnectionBad(void)"
(?ConnectionBad@PgConnection@@QAEHXZ)
dbpostgres.obj : error LNK2001: unresolved external symbol "public: int __thiscall PgDatabase::Tuples(void)"
(?Tuples@PgDatabase@@QAEHXZ)
dbpostgres.obj : error LNK2001: unresolved external symbol "public: int __thiscall PgConnection::ExecTuplesOk(char
const*)" (?ExecTuplesOk@PgConnection@@QAEHPBD@Z) 
dbpostgres.obj : error LNK2001: unresolved external symbol "public: char const * __thiscall PgDatabase::FieldName(int)"
(?FieldName@PgDatabase@@QAEPBDH@Z)
dbpostgres.obj : error LNK2001: unresolved external symbol "public: int __thiscall PgDatabase::Fields(void)"
(?Fields@PgDatabase@@QAEHXZ)
dbpostgres.obj : error LNK2001: unresolved external symbol "public: char const * __thiscall
PgDatabase::GetValue(int,int)"(?GetValue@PgDatabase@@QAEPBDHH@Z) 
dbpostgres.obj : error LNK2001: unresolved external symbol "public: __thiscall PgConnection::PgConnection(char const
*)"(??0PgConnection@@QAE@PBD@Z) 
dbpostgres.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall
PgConnection::~PgConnection(void)"(??1PgConnection@@UAE@XZ) 
pq++.lib(pq++.dll) : error LNK2001: unresolved external symbolpq++_NULL_THUNK_DATA
Debug/dblayer.exe : fatal error LNK1120: 9 unresolved externals
Error executing link.exe.

I make the pq++.lib file with these command

dlltool --output-def pq++.def --dllname pq++ pq++.dll
lib /DEF:pq++.def

but pq++.lib doesn't works :(

Someone can help me?

Thanks

--
David
To err is human...to really foul up requires the root password.