> because it's missing a trailing slash.

I found RFC 2616, which I hope is relevant to this question. It states in
3.2.2 "http URL":

 The "http" scheme is used to locate network resources via the HTTP protocol.
This section defines the scheme-specific syntax and semantics for http URLs.

http_URL = "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]] 

... If the abs_path is not present in the URL, it MUST be given as "/" when
used as a Request-URI for a resource..."

This mean that even without a trailing /, i.e. with an empty abs_path,
it is a perfectly valid URL. It just should be trated as if it had a trailing
/.
So if pkglint complains here it is wrong.

-- 
Georg Schwarz    http://home.pages.de/~schwarz/
 georg.schwarz@freenet.de  +49 178 8545053