"port provides" inside a Portfile?

[René JV Bertin]

On 06 Apr 2015, at 04:42, Lawrence Velázquez <larryv at macports.org> wrote:

> 
> https://trac.macports.org/wiki/PortfileRecipes#deactivatehack

I'm quite certain I could have used recipes from that page (e.g. to deactivate the 'standard' port when installing/activating the -devel version). 
Did I miss a pointer to the page on guide.macports.org?

R