[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 i0ntempest):

 Try changing the compiler blacklist at line 39 to:
 {{{compiler.blacklist-append *gcc-3.* *gcc-4.* *gcc-5.* *gcc-6.* *gcc-7.*
 {clang < 1100} }}} and building again. You can get to the portfile using
 {{{port edit qbittorrent-qt5}}}.

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Ticket URL: <https://trac.macports.org/ticket/66956#comment:13>
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