ludo@gnu.org (Ludovic Courtès) writes:

> Mathieu Lirzin <mthl@gnu.org> skribis:
>
>> * gnu/packages/version-control.scm (reposurgeon): New variable.
>
> [...]
>
>> +         (add-before 'build 'fix-docbook
>> +           (lambda* (#:key inputs #:allow-other-keys)
>> +             (setenv "XML_CATALOG_FILE"
>> +                     (string-append (assoc-ref inputs "docbook-xsl")
>> +                                    "/xml/xsl/docbook-xsl-"
>> +                                    ,(package-version docbook-xsl)
>> +                                    "/manpages/docbook.xsl"))
>
> Could you add a comment on why this is needed?
> Normally, with libxml2 as an input, ‘XML_CATALOG_FILE’ should be
> properly initialized.

In fact that was not needed, so I have removed this snippet.

>> +             ;; xsltproc generates random ids when the source document doesn't
>> +             ;; provide them.  This is making the build not reproducible.
>> +             (substitute* "reposurgeon.xml"
>
> Eventually we should fix it in libxslt along these lines:
>
>   https://bugzilla.gnome.org/show_bug.cgi?id=758148
>
> Could you send an updated patch?

After some digging, I have found that the generated IDs were based on
their node pointer address in the parse tree.  So I have added an
additional patch which should be applied in the next release of libxslt.