[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:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Low          |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue):

 We are also running other tools such as git or svn that do not have flags
 to select the IP protocol version. Therefore these flags could be
 misleading, as they would only refer to the use of libcurl within MacPorts
 internally. Hosts like `github.com` are well-known to only support IPv4 at
 the time of this writing, so with a `-6` flag enabling IPv6 only,
 downloads would fail.

 One option that could work for you would be to set up firewall rules with
 `pfctl` to block IPv4 access to MacPorts mirrors.

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Ticket URL: <https://trac.macports.org/ticket/53546#comment:4>
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