[MacPorts] #49631: rtorrent: build error: 'tr1/functional' file not found

[MacPorts]

#49631: rtorrent: build error: 'tr1/functional' file not found
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  Reporter:  macports@…  |      Owner:  stuartwesterman@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  mavericks yosemite elcapitan
      Port:  rtorrent    |
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Comment (by macports@…):

 Replying to [comment:1 ryandesign@…]:
 > You shouldn't have even gotten this far: you should've seen the same
 problem with rtorrent's dependency libtorrent already; see #41417. Note:
 the suggestion in that ticket to use a MacPorts gcc compiler is ''not''
 recommended. Instead the port should be updated to a version compatible
 with Mavericks and later.

 Somehow I have libtorrent @0.13.2_0 (active), and I know I didn’t do any
 special workarounds.

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Ticket URL: <https://trac.macports.org/ticket/49631#comment:2>
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