Portfile for a virtual port?

[Joshua Root]

On 2011-8-9 03:41 , Mike O'Brien wrote:
> 	We need to construct a virtual port.  We wish to allow our users to have one-click installation access to a coterie of ports in MacPorts, between six and twenty of them which are constituent ports making up an open-source Matlab replacement called Python(x,y).  There is no current metaport for this, and no instructions on how to make one, though it is trivially easy (thank you!) to construct a metapackage for a single port and all of its dependencies.
> 
> 	What I'm looking to construct is a port which itself installs nothing, but whose dependencies cause all of the constituent ports comprising Python(x,y) to be installed.  Then I can make a metapackage for that port, and distribute the resulting ".mpkg" file to our users.
> 
> 	Is there an accepted, canonical way to do this?  The trivial way to do it would be to null out all the parts of a portfile, except the "devroot" (install) section is not allowed to be null.

There are a bunch of ports that do this, gimp and texlive are examples
off the top of my head. You just have to create one file in the
destroot, traditionally a README.

- Josh