Comment 7 for bug 1659336

Eduard Braun wrote:
> Do you know if we have to install all the empty folders too, or can
> we safely omit them and only install the index.theme?

As far as I understand it's save to omit them (as long as any missing (sub-)directories are created when installing Inkscape - check cmake's install_manifest.txt). Depending on what (else) was installed in the current prefix, they might not all be empty, anyway:
<quote>
In order to have a place for third party applications to install their icons there should always exist a theme called "hicolor" [1]. The data for the hicolor theme is available for download at: http://www.freedesktop.org/software/icon-theme/. Implementations are required to look in the "hicolor" theme if an icon was not found in the current theme.
</quote>
https://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#directory_layout