[MacPorts] #39939: Documentation: subports

[MacPorts]

#39939: Documentation: subports
-------------------------+---------------------
 Reporter:  software@…   |      Owner:  markd@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  guide        |    Version:  2.2.0
 Keywords:               |       Port:
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 I asked the following on the mailing list, and noted that this is not
 mentioned on the guide nor in the man page. Could this be added there?

 Freek Dijkstra asked:

 >> I've just created a Portfile for a python module, and like to test
 this. My normal action is just cd to the folder where the Portfile is
 located and type "port build".
 >>
 >> However, I'm getting an error:
 >>
 >> `--->  Computing dependencies for py-pypdf2`
 >>
 >> `Error: Dependency 'py27-pypdf2' not found.`
 >>
 >> I realised I don't want to build py-pypdf2 but rather py27-pypdf2. How
 do I specify the Python version to use? "port build py27-pypdf2" seems to
 check the Port database, and ignores the local folder.

 Jeremy Lavergne answered:

 > You want to append "subport=$name" to the command:
 >
 > `sudo port build subport=py27-pypdf2`

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Ticket URL: <https://trac.macports.org/ticket/39939>
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