[MacPorts] #59235: MacVim fails to build on macOS 10.15 Catalina

[MacPorts]

#59235: MacVim fails to build on macOS 10.15 Catalina
---------------------+----------------------
  Reporter:  moyang  |      Owner:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.1
Resolution:          |   Keywords:
      Port:  MacVim  |
---------------------+----------------------

Comment (by nblievers):

 The first issue is fixed by adding
 use_xcode yes
 to the Portfile. But then there is a compilation error, which seems kinda
 weird. It is easy enough to fix :
 --- src/MacVim/PSMTabBarControl/source/PSMTabBarCell.h~ 2019-10-25
 15:01:08.000000000 +1100
 +++ src/MacVim/PSMTabBarControl/source/PSMTabBarCell.h  2019-10-25
 14:55:23.000000000 +1100
 @@ -32,6 +32,7 @@
      BOOL                _hasIcon;
      int                 _count;
      NSString            *_toolTip;
 +    PSMTabBarControl   *_controlView;
  }

  // creation/destruction

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Ticket URL: <https://trac.macports.org/ticket/59235#comment:10>
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