[MacPorts] #62018: fltk-config --cxxflags returns invalid value on macOS Big Sur 11.1

[MacPorts]

#62018: fltk-config --cxxflags returns invalid value on macOS Big Sur 11.1
---------------------------+-----------------------
  Reporter:  markuskimius  |      Owner:  michaelld
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:  fixed         |   Keywords:  bigsur
      Port:  fltk-devel    |
---------------------------+-----------------------
Changes (by ryandesign):

 * keywords:  fltk-devel, Big Sur, macOS 11.1, SDK => bigsur


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Ticket URL: <https://trac.macports.org/ticket/62018#comment:3>
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