[MacPorts] #69558: mutt doesn't support header_cache directive

[MacPorts]

#69558: mutt doesn't support header_cache directive
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  Reporter:  gbergling    |      Owner:  l2dy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mutt         |
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Comment (by l2dy):

 If you install mutt with one of the three cache database variants, e.g.
 `port install mutt +gdbm`, you can enable header cache.

 It was not added to `default_variants` because I don't know which one to
 use as default.

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Ticket URL: <https://trac.macports.org/ticket/69558#comment:2>
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