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+<appendix xmlns="http://docbook.org/ns/docbook"
+          xmlns:xlink="http://www.w3.org/1999/xlink">
+
+<title>Bugs / To-Do</title>
+
+
+<itemizedlist>
+
+<listitem><para>The man-pages generated from the DocBook documentation
+are ugly.</para></listitem>
+
+<listitem><para>Generations properly form a tree.  E.g., if after
+switching to generation 39, we perform an installation action, a
+generation 43 is created which is a descendant of 39, not 42.  So a
+rollback from 43 ought to go back to 39.  This is not currently
+implemented; generations form a linear sequence.</para></listitem>
+
+<listitem><para>For security, <command>nix-push</command> manifests
+should be digitally signed, and <command>nix-pull</command> should
+verify the signatures.  The actual NAR archives in the cache do not
+need to be signed, since the manifest contains cryptographic hashes of
+these files (and <filename>fetchurl.nix</filename> checks
+them).</para></listitem>
+
+<listitem><para>It would be useful to have an option in
+<command>nix-env --delete-generations</command> to remove non-current
+generations older than a certain age.</para></listitem>
+
+<listitem><para>There should be a flexible way to change the user
+environment builder.  Currently, you have to replace
+<filename><replaceable>prefix</replaceable>/share/nix/corepkgs/buildenv/builder.pl</filename>,
+which is hard-coded into <command>nix-env</command>.  Also, the
+default builder should be more powerful.  For instance, there should
+be some way to specify priorities to resolve
+collisions.</para></listitem>
+
+</itemizedlist>
+
+</appendix>