borland C++ 5.0 et port gpib

Salut tout le monde,

Tout d'abord je tenais a m'excuser si je ne suis pas dans la bonne rubrique, je suis un peu perdu (débutant...)

Voila mon soucis, je dois commander un analyseur de spectre HP35670A avec un PC qui fonctionne avec windows 95. Mon logiciel est borland C++ 5.0.
Voila mon code:
/* FILE NAME : EXAMP1.C */
/* Program Example : INTERACTIVE DATA TRANSFER */
/* */
/* Purpose : This program outputs data strings entered by user */
/* and enters data string from the GP-IB. */
/* */
/* */
/* Language : C86 */
/* */
#include <stdio.h>
#include <string.h>

int ioerr;

main()
{
char s;
ieseg(0xD000);
ieinit(0x2b8,21,0x100);
ieabort();
start: crt_cls();

printf("****** Demo Program for GP-IB interface ****** \n");
printf("\n\n\n 1 : OUTPUT DATA");
printf("\n\n\n 2 : ENTER DATA");
printf("\n\n\n 3 : EXIT");
printf("\n\n\n Select a function : ");
s=0;
while(s>51 || s<49)s=key_getc();
printf("%c",s);
switch(s)
{
case '1': output();
break;
case '2': enter();
break;
case '3': exit(0);
default : printf("SOMETHING WRONG !");
}
goto start;
}

output()
{
int addr,length;
char outstr[100];
char s;
do
{
printf("\n\n\n OUTPUT DATA :\n");
printf("\n To which address ? ");
scanf("%d",&addr);
printf("\n Output string ? ");
scanf("%s",outstr);
length=strlen(outstr);
ioerr=ieoutput(addr,outstr,length);
iochk();
printf("\n Output data again ?(y/n)");
s=key_getc();
}while(s=='y');
}

enter()
{
int addr,length;
char instr[100];
char s;

do
{
printf("\n\n\n ENTER DATA :\n");
printf("\n From which address ? ");
scanf("%d",&addr);
printf("\n Entered string : ");
ioerr=ieenter(addr,instr,100);
iochk();
printf("%s\n",instr);
printf("\n Enter data again ?(y/n)");
s=key_getc();
}while(s=='y');
}

iochk()
{
switch(ioerr)
{
case 0 : printf("\n Data transfered!\n\n");
break;
case 1 : printf("\n Handshake timeout ! \n\n");
break;
default : printf("\n Interface Error ! \n\n");
break;

}

et voici les messages d'erreur lorsque je build le projet:
Info :essai1.rc: out of date with destination C:\TEST\THOMAS\essai1.res
Info :essai1.rc: source date 31:63.31 15/31/2107 destination date 12:21.02 8/ 9/2007
Info :Linking C:\TEST\THOMAS\cbgpib31.dll
Info :Linking C:\TEST\THOMAS\gpib-32.dll
Info :Transferring to C:\BC5\BIN\implib.exe @C:\WINDOWS\TEMP\RSP0.$$$
Info :Compiling C:\test\thomas\essai1.c
Warn :essai1.c(18,16):Call to function 'ieseg' with no prototype
Warn :essai1.c(19,25):Call to function 'ieinit' with no prototype
Warn :essai1.c(20,12):Call to function 'ieabort' with no prototype
Warn :essai1.c(21,18):Call to function 'crt_cls' with no prototype
Warn :essai1.c(29,34):Call to function 'key_getc' with no prototype
Warn :essai1.c(29,24):Conversion may lose significant digits
Warn :essai1.c(33,22):Call to function 'output' with no prototype
Warn :essai1.c(35,21):Call to function 'enter' with no prototype
Warn :essai1.c(37,21):Call to function 'exit' with no prototype
Warn :essai1.c(56,37):Call to function 'ieoutput' with no prototype
Warn :essai1.c(57,10):Call to function 'iochk' with no prototype
Warn :essai1.c(59,15):Call to function 'key_getc' with no prototype
Warn :essai1.c(59,5):Conversion may lose significant digits
Warn :essai1.c(61,2):Function should return a value
Warn :essai1.c(75,32):Call to function 'ieenter' with no prototype
Warn :essai1.c(76,10):Call to function 'iochk' with no prototype
Warn :essai1.c(79,15):Call to function 'key_getc' with no prototype
Warn :essai1.c(79,5):Conversion may lose significant digits
Warn :essai1.c(81,2):Function should return a value
Warn :essai1.c(81,2):'length' is declared but never used
Warn :essai1.c(94,2):Function should return a value
Info :Resource compiling C:\test\thomas\essai1.rc
Info :Linking C:\TEST\THOMAS\essai1.exe
Error:Error: Unresolved external '_ieseg' referenced from module essai1.c
Error:Error: Unresolved external '_ieinit' referenced from module essai1.c
Error:Error: Unresolved external '_ieabort' referenced from module essai1.c
Error:Error: Unresolved external '_crt_cls' referenced from module essai1.c
Error:Error: Unresolved external '_key_getc' referenced from module essai1.c
Error:Error: Unresolved external '_ieoutput' referenced from module essai1.c
Error:Error: Unresolved external '_ieenter' referenced from module essai1.c

Ceci doit certainement un probleme de librairies mais étant un débutant dans la matière je ne sais pas comment resoudre ce probleme.

Merci de m aider et bon courage