Why do we have @ in modules builds?

[John D. Hendrickson]

Warner Losh wrote:
> Does anybody recall why we have @ symlink in our module builds?
> I’m constantly working around issues that this creates. Maybe it is time
> to eliminate it?
> 
> So I’ve posted the following review: https://reviews.freebsd.org/D1100
> 
> Warner
> 

could you please post what it is that "does not work"

and what is is "you must do" to work around it ?