[Dev-C++] Small question

#include <linux/pci.h>

void init_dev(int x, int y)
    {if(pci_present()){//do some stuff=20
                           return;};
     return;};
int u,v;
int main()
   {int_dev(u, v);
    pci_find_device(arguments );
  return 0;
   };

//////////////////////////////////compiler =
//////////////////////////////////////
undefined reference to "pci_present"
/////////////////////////////////////////////////////////////////////////=
////////////
  =20
why?
say i link to pci.a
doesn't seem to make any difference=20
help