mini-httpd NCSA license

[Alexandru Mihail <alexandru_mihail@protonmail.ch>]

Dear debian-legal,
I would like to better sum up my earlier question as follows:
I'm in the process of adopting the mini-httpd package.
mini-httpd contains early portions of code commited by Rob
McCool which seem to originate from NCSA httpd. (License: https://web.archive.org/web/20060830015540/http://hoohoo.ncsa.uiuc.edu/docs-1.5/Copyright.html)
There is no mention of this in our package's copyright file. How do we proceed to clarify this situation? (DFSG ?)
apache2 might be in the very same situation.
Kind regards,
Alexandru Mihail