[MacPorts] #53546: Add IPv4 and IPv6 flag (-4, -6)

[MacPorts]

#53546: Add IPv4 and IPv6 flag (-4, -6)
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  Reporter:  l2dy         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 Could you describe the problem and your proposed solution in more detail?

 It sounds like you're talking about a client that has both IPv4 and IPv6
 connectivity, but one of these connections is "better" for this client for
 some reason, but MacPorts picks the wrong one. What is your proposal for
 how MacPorts should pick the better one?

 How do other network-enabled programs on this hypothetical client avoid
 the same problem?

 You mention adding `-4` and `-6` flags. Reading the curl manpage, it seems
 these options force the use of IPv4 and IPv6, respectively, so they are
 effectively mutually exclusive. Are you suggesting that the user should be
 able to specify whether to use IPv4 or IPv6 connections, for example with
 a new setting in macports.conf?

 Note that MacPorts doesn't run the `curl` program; it calls the libcurl
 library directly. So we wouldn't be using `-4` or `-6` flags; we'd be
 doing whatever the API equivalent of that is.

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Ticket URL: <https://trac.macports.org/ticket/53546#comment:1>
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