[MacPorts] #54546: lftp needs to have aclocal run pre-configure, or else it fails to build on Sierra

[MacPorts]

#54546: lftp needs to have aclocal run pre-configure, or else it fails to build on
Sierra
---------------------------+-------------------------
  Reporter:  vjorlikowski  |      Owner:  Schamschula
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  lftp          |
---------------------------+-------------------------
Changes (by ryandesign):

 * keywords:   => haspatch
 * owner:   => Schamschula
 * status:  new => assigned
 * port:   => lftp


Comment:

 Use the `-W` flag rather than manually running `cd`.

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Ticket URL: <https://trac.macports.org/ticket/54546#comment:1>
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