[MacPorts] #40707: enable GSSAPI/Kerberos in serf1

[MacPorts]

#40707: enable GSSAPI/Kerberos in serf1
-----------------------------+--------------------------------
 Reporter:  dogcow@…         |      Owner:  macports-tickets@…
     Type:  enhancement      |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.2.0
 Keywords:  kerberos gssapi  |       Port:  serf1
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 By default, serf-1.3.1 and prior (at very least) do not enable use of
 Kerberos and/or GSSAPI; they can be enabled by invoking scons as `scons
 GSSAPI=/path/to/kerb` - e.g. `scons GSSAPI=/usr` for the system libraries,
 `scons GSSAPI=${prefix}` for the macports-provided kerberos libraries,
 etc.

 It would be nice if it were enableable by default or as a variant.

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Ticket URL: <https://trac.macports.org/ticket/40707>
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