gscan2pdf: put license_noconflict allowed for libpaper?

[tenzap]

According to the builder logs:

"gscan2pdf" is not distributable because its license "GPL-3" conflicts with license "GPL-2" of dependency "libpaper"
Staging private archive for upload: gscan2pdf-2.12.4_0.darwin_15.x86_64.tbz2

I checked the dependency tree:

gscan2pdf <- ImageMagick <- ghostscript <- libpaper

Aso, there is no reference to the headers of libpaper in gscan2pdf sources.

So, is it ok to add this in the portfile?

license_noconflict libpaper

[jmroot (Joshua Root)]

Conflicts can happen through indirect use, not just direct use. You have to look at what libraries gscan2pdf is linked with, and what libraries they are linked with, recursively.

[tenzap]

gscan2pdf is written in perl, so no direct lib dependency afaik. There is no header from libpaper used is in the sources of gscan2pdf.

[jmroot (Joshua Root)]

It doesn't matter what language the program happens to be written in. What matters is whether a combined work is being created that is covered by two or more conflicting licenses. Including a header is just one of several ways that can happen.