callout gifs copied from docbook

[thkoch2001]

This issue was part of the rejection reasons in the first review of nix for entrance in the Debian archive, see https://salsa.debian.org/debian/nix/issues/9.

The gif icons in doc/manual/images/callouts/ are copied from docbook: b0a09a6

I can copy the correct copyright for these files from the docbook package:
https://metadata.ftp-master.debian.org/changelogs//main/d/docbook-xsl/docbook-xsl_1.79.1+dfsg-2_copyright

Or I can remove this files from a repackaged source tarball and use the ones from the docbook package.

Or you try how it looks to build the manual without these graphics. If I understand this correct, it is possible to not use graphic files:
http://docbook.sourceforge.net/release/xsl/1.79.1/doc/fo/callout.graphics.html

Related question: Why do you bother to ship a compiled manual.html and manpages in the release tarball at all? It is a source tarball and contains the makefiles to build the docs. For me as a distribution packager it is easier to just build everything from source instead of checking whether I really have the source of everything I distribute.

[edolstra]

The reason for shipping a compiled manual was to reduce the number of dependencies needed to build Nix (i.e. the same reason for including generated flex/bison output). However, I've been thinking about getting rid of the source tarball entirely, since it doesn't provide a lot of value anymore - people who want to build from source can also just do a Git checkout of the release tag.