[MacPorts] #66956: qbittorrent @4.5.1: build failure, undefined symbols for std::filesystem on 10.14

[MacPorts]

#66956: qbittorrent @4.5.1: build failure, undefined symbols for std::filesystem on
10.14
----------------------------+------------------------
  Reporter:  contextnerror  |      Owner:  i0ntempest
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:  fixed          |   Keywords:  mojave
      Port:  qBittorrent    |
----------------------------+------------------------

Comment (by contextnerror):

 Yeah, that one was my mistake. Now it's giving errors about not being able
 to find "filesystem" instead:

 {{{
 :info:build In file included from app/cmdoptions.cpp:31:
 :info:build In file included from app/cmdoptions.h:39:
 :info:build ./base/path.h:32:10: fatal error: 'filesystem' file not found
 :info:build #include <filesystem>
 :info:build          ^~~~~~~~~~~~`
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66956#comment:12>
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