[MacPorts] #56638: p5-tkx doesn't depend on or use tk port

[MacPorts]

#56638: p5-tkx doesn't depend on or use tk port
--------------------------+--------------------
 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.5.2
 Keywords:                |       Port:  p5-tkx
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 p5-tkx doesn't depend on the tk port. For comparison, other package
 managers have their Tkx package depend on Tk (e.g. on debian, libtkx-perl
 depends on Tk). Is it intentionally omitted from the port?

 However, even if p5-tkx did depend on tk, I don't think it would have any
 effect, since the system's Tcl/Tk is being used (reports version 8.5.9 on
 macOS 10.13) even when MacPorts' Tcl/Tk (8.6.8) is installed. And Tkx does
 not appear to be the only module with this issue: I've installed Tcl::pTk
 (separately from CPAN, though I'm interested in creating a port for it)
 and I observe that it uses the system Tcl/Tk as well. So I'm wondering if
 the issue might be in either the p5-tcl, tcl, or tk ports.

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Ticket URL: <https://trac.macports.org/ticket/56638>
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