problem whith libpq

I am a french student and i must do a sql database
witch interract with a vxworks system.

My solution is to use a client/serveur in C and a sql
database controled by a C program
Is it the best solution??
if no what is it?
if yes,i wrote a test program in c but it doesn't
work.
he is based on your example "sample program" at the
end of the chapter 16 of your documentation
can you tell me why i can't compile it ?
there is all the code of the application here
If you can't help me , can you give me a place or mail
of persons who can help me ?
Thank you :)

//command for postmaster

postmaster -i -p 12032 -D /home/magic/db

//source code of the test application testpqlib.c:

#include <stdio.h>
#include <pgsql/pqlib-fe.h>

void exit_nicely(PGconn *conn)
{
PQfinish(conn);
exit(1);
}

main()
{
char *pghost,
*pgport,
*pgoption,
*pgtty,
*dbname;
PGconn *conn;
PGresult *res;
char toto[]="12032";

/*initialisation des parametres de la connection*/
pghost=NULL;
pgport=toto;
pgoption=NULL;
pgtty=NULL;
dbname="projet";
/*etablissement de la connection*/
conn=PQsetdb(pghost,pgport,pgoption,pgtty,dbname);
/*test de la connection a la bdd*/
if (PQstatus(conn)==CONNECTION_BAD)
{
printf("connection échouée");
printf("%s",PQerrorMessage(conn));
exit_nicely(conn);
}
exit_nicely(conn);
}

//command for compilation

gcc testpqlib.c -o testpqlib

//output errors of the compilator:

[magic(at)profs testsdivers]$ gcc testpqlib.c -o
testpqlib
/tmp/ccmMWakA.o: In function `exit_nicely':
/tmp/ccmMWakA.o(.text+0x8): undefined reference to
`PQfinish'
/tmp/ccmMWakA.o: In function `main':
/tmp/ccmMWakA.o(.text+0x88): undefined reference to
`PQsetdbLogin'
/tmp/ccmMWakA.o(.text+0x99): undefined reference to
`PQstatus'
/tmp/ccmMWakA.o(.text+0xb9): undefined reference to
`PQerrorMessage'

loic lecoeur
Caen (France)
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