Работа с PostgreSQL в Cи

[TIT]

Делаю, как в мануале, но не работает.



Вот, что делаю:

tit@tubuntu:~/labs/C$ cat ./main.c

#include "/usr/include/postgresql/libpq-fe.h"
#include <stdio.h>
#include <stdlib.h>
void main()
{
	const char *conninfo= "dbname=HOSTNAME host=HOSTADDRESS username=USERNAME";
	PGconn *conn=PQconnectdb(conninfo);
	if (PQstatus(conn) != CONNECTION_OK)
	{
		fprintf(stderr, "Не удалось соединиться с базой данных: %s",PQerrorMessage(conn));
	}
}

Вот что выдаёт при компиляции:

tit@tubuntu:~/labs/C$ gcc ./main.c

/tmp/ccaCtHxX.o: In function `main':
main.c:(.text+0x19): undefined reference to `PQconnectdb'
main.c:(.text+0x29): undefined reference to `PQstatus'
main.c:(.text+0x39): undefined reference to `PQerrorMessage'
collect2: ld returned 1 exit status

Вывод pg_config (если надо):

tit@tubuntu:~/labs/C$ pg_config

BINDIR = /usr/lib/postgresql/8.4/bin
DOCDIR = /usr/share/doc/postgresql
HTMLDIR = /usr/share/doc/postgresql
INCLUDEDIR = /usr/include/postgresql
PKGINCLUDEDIR = /usr/include/postgresql
INCLUDEDIR-SERVER = /usr/include/postgresql/8.4/server
LIBDIR = /usr/lib
PKGLIBDIR = /usr/lib/postgresql/8.4/lib
LOCALEDIR = /usr/share/locale
MANDIR = /usr/share/postgresql/8.4/man
SHAREDIR = /usr/share/postgresql/8.4
SYSCONFDIR = /etc/postgresql-common
PGXS = /usr/lib/postgresql/8.4/lib/pgxs/src/makefiles/pgxs.mk
CONFIGURE = '--build=i486-linux-gnu' '--prefix=/usr' '--includedir=/usr/include' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=/usr/lib/postgresql-8.4' '--disable-maintainer-mode' '--disable-dependency-tracking' '--srcdir=.' '--mandir=/usr/share/postgresql/8.4/man' '--with-docdir=/usr/share/doc/postgresql-doc-8.4' '--sysconfdir=/etc/postgresql-common' '--datadir=/usr/share/postgresql/8.4' '--bindir=/usr/lib/postgresql/8.4/bin' '--includedir=/usr/include/postgresql/' '--enable-nls' '--enable-integer-datetimes' '--enable-thread-safety' '--enable-debug' '--disable-rpath' '--with-tcl' '--with-perl' '--with-python' '--with-pam' '--with-krb5' '--with-gssapi' '--with-openssl' '--with-libxml' '--with-libxslt' '--with-ldap' '--with-ossp-uuid' '--with-gnu-ld' '--with-tclconfig=/usr/lib/tcl8.5' '--with-tkconfig=/usr/lib/tk8.5' '--with-includes=/usr/include/tcl8.5' '--with-system-tzdata=/usr/share/zoneinfo' '--with-pgport=5432' 'CFLAGS=-g -O2 -g -Wall -O2 -fPIC' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,--as-needed' 'build_alias=i486-linux-gnu' 'CC=cc' 'CPPFLAGS='
CC = cc
CPPFLAGS = -D_GNU_SOURCE -I/usr/include/libxml2 -I/usr/include/tcl8.5
CFLAGS = -g -O2 -g -Wall -O2 -fPIC -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv -g
CFLAGS_SL = -fpic
LDFLAGS = -Wl,-Bsymbolic-functions -Wl,--as-needed -Wl,--as-needed
LDFLAGS_SL = 
LIBS = -lpgport -lxslt -lxml2 -lpam -lssl -lcrypto -lkrb5 -lcom_err -lgssapi_krb5 -lz -lreadline -lcrypt -ldl -lm 
VERSION = PostgreSQL 8.4.1

Что я делаю не так?