<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" xml:id="chap-hooks"> <title>Hooks reference</title> <para> Nixpkgs has several hook packages that augment the stdenv phases. </para> <xi:include href="./postgresql-test-hook.section.xml" /> </chapter>