[bug#34198] [PATCH 2/2] gnu: Add diffpdf.

[Ricardo Wurmus]

Hi Danny,

> * gnu/packages/pdf.scm (diffpdf): New variable.
[…]
> +    (build-system gnu-build-system)
> +    (arguments
> +     `(#:phases
> +       (modify-phases %standard-phases
> +         (add-after 'unpack 'patch-paths
> +           (lambda* (#:key inputs #:allow-other-keys)
> +             (substitute* "diffpdf.pro"
> +              (("-lpoppler-qt4")
> +               (string-append "-L" (assoc-ref inputs "poppler-qt4")
> +                              "/lib -lpoppler-qt4"))

Is this really necessary?  Shouldn’t it be enough to have this directory
on LIBRARY_PATH at build time?

> +    (inputs
> +     `(("poppler-qt4" ,poppler-qt4) ; at least 0.20.1
> +       ("qt-4" ,qt-4)))

I was hoping we could get rid of Qt 4 in the near future, because it
doesn’t get security fixes.  Is there no Qt 5 variant?

> +    (home-page "http://www.qtrac.eu/diffpdf-foss.html";)
> +    (synopsis "Compare two PDF files")
> +    (description "This package provides a GUI tool to compare two PDF 
> files.")
> +    (license license:gpl2)))

Looks like GPLv2 or later.

--
Ricardo