gentoo's package.provided equivalent?

[abi at abinet.ru]

If library in port tree you can fetch old version of the port from svn
manually or with portdowngrade. 

anatoly at kazanfieldhockey.ru писал 2016-04-03 04:54: 

> Sometimes i need to build specific version of some library from source,
> not from ports. How can I tell port system about it. There was no problem
> with old pkg_, because I was able just to put dummy directory into
> /var/db/pkg and port system knows it is installed (although maybe that was
> ugly hack). But what I can do with pkgng now? For example, Gentoo linux
> has /etc/portage/profile/package.provided file for such a situation. Is
> there some equivalent?
> 
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