libpq compile error

Hello.

I try to compile the 1.1 example code which is shown at the page
http://postgresql.mirror.easynet.be/users-lounge/docs/7.1/programmer/libpq-e
xample.html.

I run OpenBSD 2.9 (i386) and I installed the 7.1 Postgresql client
interface.

I do this :

bash-2.04$
bash-2.04$
bash-2.04$
bash-2.04$ gcc -v -I/usr/local/include/postgresql/ -o testlibpq testlibpq.c

Reading specs from /usr/lib/gcc-lib/i386-unknown-openbsd2.9/2.95.3/specs
gcc version 2.95.3 20010125 (prerelease)
/usr/lib/gcc-lib/i386-unknown-openbsd2.9/2.95.3/cpp0 -lang-c -v
-I/usr/local/include/post
gresql/ -D__GNUC__=2 -D__GNUC_MINOR__=95 -D__unix__ -D__i386__ -D__OpenBSD__
-D__unix__ -D
__i386__ -D__OpenBSD__ -Asystem(unix) -Asystem(OpenBSD) -Acpu(i386)
-Amachine(i386) testli
bpq.c /tmp/cctlz476.i
GNU CPP version 2.95.3 20010125 (prerelease) (80386, BSD syntax)
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include/postgresql
/usr/include
End of search list.
The following default directories have been omitted from the search path:
/usr/include/g++
End of omitted list.
/usr/lib/gcc-lib/i386-unknown-openbsd2.9/2.95.3/cc1 /tmp/cctlz476.i -quiet
-dumpbase test
libpq.c -version -o /tmp/ccLqy476.s
GNU C version 2.95.3 20010125 (prerelease) (i386-unknown-openbsd2.9)
compiled by GNU C ver
sion 2.95.3 20010125 (prerelease).
as -o /tmp/ccSis476.o /tmp/ccLqy476.s
/usr/lib/gcc-lib/i386-unknown-openbsd2.9/2.95.3/collect2 -e start -dc -dp
-o testlibpq /u
sr/lib/crt0.o -L/usr/lib/gcc-lib/i386-unknown-openbsd2.9/2.95.3
/tmp/ccSis476.o -lgcc -lc
-lgcc
/tmp/ccSis476.o: Undefined symbol `_PQfinish' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQsetdbLogin' referenced from text
segment
/tmp/ccSis476.o: Undefined symbol `_PQstatus' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQerrorMessage' referenced from text
segment
/tmp/ccSis476.o: Undefined symbol `_PQexec' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQresultStatus' referenced from text
segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQexec' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQresultStatus' referenced from text
segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQexec' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQresultStatus' referenced from text
segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQnfields' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQfname' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQntuples' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQgetvalue' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQexec' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQexec' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQclear' referenced from text segment
/tmp/ccSis476.o: Undefined symbol `_PQfinish' referenced from text segment
collect2: ld returned 1 exit status