Howto use autoconf-archive

[Gordon]

Hello,

how do I actually use the macros contained in autoconv-archive in my own
project?

I'm using Ubuntu 8.04, and I installed the packages autoconf 2.61-4 and
autoconf-archive 20070512-1. In my own configure.ac file, I'd like to
use AX_LIB_POSTGRESQL, for example. I run libtoolize --force && aclocal
&& autoconf && autoheader && automake --add-missing && configure. And I get
./configure: line 19787: AX_LIB_POSTGRESQL: command not found

What is the recommended, most portable way to use these macros in
autoconf-archive? Do I just copy the contents of ax_lib_postgresql.m4
into my own configure.ac? Or can autoconf be told that the macros in
autoconv-archive are available for use?

Thanks for your help in advance,
Gordon