Quoting from /usr/share/doc/libcgal-dev/README.Debian:
[...]
Note that the CGAL documentation cannot be packaged for Debian due to unclear
license conditions. The complete documentation in PDF and HTML is available at
http://www.cgal.org/.
[...]
Upstream knows about this, but there is no short-term solution in sight. It
might help if you contact upstream directly via the CGAL mailing list.
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