bug#26500: [PATCH] gnu: Add mcomix.

[nee]

Am 16.04.2017 um 10:53 schrieb Arun Isaac:
> Instead of mentioning p7zip, unrar and mupdf in the description, it
> would be better if we could make them inputs and patch all references to
> the executables in the source with their absolute paths. Could you try this?
I could try that, but mupdf is a pretty heavy dependency. guix size says
it's self-size is 208MiB and total-size is 491MiB.
I personally never needed it with mcomix, so I like that it is optional.
Is there some way to define a package with optional inputs?

For now I'm appending my WIP that should address your previous remarks.

0001-gnu-Add-mcomix.patch
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