GSL with borland c++ 5.0

[lukasz_urbanski@.....]

Hello All,
I used implib tool to create libgsl.lib & libgslcblas.lib files. But after linking 'em to the project, I end up with the following:

[Linker Error] Unresolved external '_gsl_sf_bessel_J0' referenced from C:\PROGRAM FILES\BORLAND\CBUILDER5\PROJECTS\UNIT1.OBJ

The code is the following (just a simple form with edit boxes & button to compute bessel function):
//---------------------------------------------------------------------------

#include <vcl.h>
#include <gsl/gsl_sf_bessel.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------



void __fastcall TForm1::Button1Click(TObject *Sender)
{
double x = 0.0;
x=2;
double y = gsl_sf_bessel_J0 (x);
Edit2->Text=y;
}
//---------------------------------------------------------------------------

Does anybody have any idea, what's wrong here?
Thanks,
Best,
Lukasz