Problems - Libpq++

Hi, 

I´m trying to compile a program with Visual C++ Express Edition, using
the library Libpq++. But I don´t understand the errors that appear when
it´s compiled. 

1>------ Build started: Project: projBancoII, Configuration: Debug Win32 ------
1>Linking...
1>projBancoII.obj : error LNK2028: unresolved token (0A000015)
"public: enum ExecStatusType __clrcall Libpqpp::PgConnection::Exec(char
const *)" (?Exec@PgConnection@Libpqpp@@$$FQAM?AW4ExecStatusType@@PBD@Z)
referenced in function "private: void __clrcall
projBancoII::Form1::button1_Click(class System::Object ^,class
System::EventArgs ^)"
(?button1_Click@Form1@projBancoII@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

1>projBancoII.obj : error LNK2028: unresolved token (0A000017)
"public: bool __clrcall Libpqpp::PgConnection::ConnectionBad(void)const
" (?ConnectionBad@PgConnection@Libpqpp@@$$FQBM_NXZ) referenced in
function "private: void __clrcall
projBancoII::Form1::button1_Click(class System::Object ^,class
System::EventArgs ^)"
(?button1_Click@Form1@projBancoII@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

1>projBancoII.obj : error LNK2028: unresolved token (0A00002F)
"public: virtual __clrcall Libpqpp::PgCursor::~PgCursor(void)"
(??1PgCursor@Libpqpp@@$$FUAM@XZ) referenced in function "public:
virtual void * __clrcall Libpqpp::PgCursor::`vector deleting
destructor'(unsigned int)" (??_EPgCursor@Libpqpp@@$$FUAMPAXI@Z)

1>projBancoII.obj : error LNK2028: unresolved token (0A000030)
"public: virtual __clrcall
Libpqpp::PgTransaction::~PgTransaction(void)"
(??1PgTransaction@Libpqpp@@$$FUAM@XZ) referenced in function "public:
virtual void * __clrcall Libpqpp::PgTransaction::`vector deleting
destructor'(unsigned int)" (??_EPgTransaction@Libpqpp@@$$FUAMPAXI@Z)

1>projBancoII.obj : error LNK2028: unresolved token (0A000032)
"public: virtual __clrcall Libpqpp::PgConnection::~PgConnection(void)"
(??1PgConnection@Libpqpp@@$$FUAM@XZ) referenced in function "public:
__clrcall Libpqpp::PgDatabase::PgDatabase(char const *)"
(??0PgDatabase@Libpqpp@@$$FQAM@PBD@Z)

1>projBancoII.obj : error LNK2028: unresolved token (0A000033)
"public: __clrcall Libpqpp::PgConnection::PgConnection(char const *)"
(??0PgConnection@Libpqpp@@$$FQAM@PBD@Z) referenced in function "public:
__clrcall Libpqpp::PgDatabase::PgDatabase(char const *)"
(??0PgDatabase@Libpqpp@@$$FQAM@PBD@Z)

1>projBancoII.obj : error LNK2019: unresolved external symbol
"public: virtual __clrcall Libpqpp::PgConnection::~PgConnection(void)"
(??1PgConnection@Libpqpp@@$$FUAM@XZ) referenced in function "public:
__clrcall Libpqpp::PgDatabase::PgDatabase(char const *)"
(??0PgDatabase@Libpqpp@@$$FQAM@PBD@Z)

1>projBancoII.obj : error LNK2019: unresolved external symbol
"public: __clrcall Libpqpp::PgConnection::PgConnection(char const *)"
(??0PgConnection@Libpqpp@@$$FQAM@PBD@Z) referenced in function "public:
__clrcall Libpqpp::PgDatabase::PgDatabase(char const *)"
(??0PgDatabase@Libpqpp@@$$FQAM@PBD@Z)

1>projBancoII.obj : error LNK2019: unresolved external symbol
"public: virtual __clrcall
Libpqpp::PgTransaction::~PgTransaction(void)"
(??1PgTransaction@Libpqpp@@$$FUAM@XZ) referenced in function "public:
virtual void * __clrcall Libpqpp::PgTransaction::`vector deleting
destructor'(unsigned int)" (??_EPgTransaction@Libpqpp@@$$FUAMPAXI@Z)

1>projBancoII.obj : error LNK2019: unresolved external symbol
"public: virtual __clrcall Libpqpp::PgCursor::~PgCursor(void)"
(??1PgCursor@Libpqpp@@$$FUAM@XZ) referenced in function "public:
virtual void * __clrcall Libpqpp::PgCursor::`vector deleting
destructor'(unsigned int)" (??_EPgCursor@Libpqpp@@$$FUAMPAXI@Z)

1>projBancoII.obj : error LNK2019: unresolved external symbol
"public: enum ExecStatusType __clrcall Libpqpp::PgConnection::Exec(char
const *)" (?Exec@PgConnection@Libpqpp@@$$FQAM?AW4ExecStatusType@@PBD@Z)
referenced in function "private: void __clrcall
projBancoII::Form1::button1_Click(class System::Object ^,class
System::EventArgs ^)"
(?button1_Click@Form1@projBancoII@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

1>projBancoII.obj : error LNK2019: unresolved external symbol
"public: bool __clrcall Libpqpp::PgConnection::ConnectionBad(void)const
" (?ConnectionBad@PgConnection@Libpqpp@@$$FQBM_NXZ) referenced in
function "private: void __clrcall
projBancoII::Form1::button1_Click(class System::Object ^,class
System::EventArgs ^)"
(?button1_Click@Form1@projBancoII@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)


1>projBancoII - 13 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Thanks a lot. 

Regards, 
Chris