[MacPorts] #35955: libiodbc opportunistically links with at least gtk2

[MacPorts]

#35955: libiodbc opportunistically links with at least gtk2
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  Reporter:  ryandesign@…  |      Owner:  snc@…
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.2
Resolution:  fixed         |   Keywords:
      Port:  libiodbc      |
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Comment (by yue.liu@…):

 libiodbc has a compile option --disable-gui, in that case gtk2 and x11 are
 not needed. I think it should be solved with a "gui" variant, so user
 don't have to install x11 and gtk2 if they don't need gui.

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Ticket URL: <https://trac.macports.org/ticket/35955#comment:5>
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