Adding NOT NULL columns in PostgreSQL 7.4?

<font size="-1"><font face="Arial">I'm currently using PostgreSQL 7.4.17, and trying to add a NOT NULL column results
inan error about "Adding NOT NULL columns is not implemented". The only reports of this error I can find online relate
toPostgreSQL 7.2, and further state that it was supposed to be implemented in PostgreSQL 7.3, so I can't figure out why
it'sstill saying it's not implemented.<br /></font></font><div class="moz-signature">-- <br /><p><font color="#0000ff"
face="ComicSans MS">Michael Eshom<br /> Christian Oldies Fan<br /> Cincinnati, Ohio</font></div>