[MacPorts] #64321: MacPorts 2.7.1: build from source fails MacOs Big Sur 11.6.2 with "configure: error: tcl.h not found."

[MacPorts]

#64321: MacPorts 2.7.1: build from source fails MacOs Big Sur 11.6.2 with
"configure: error: tcl.h not found."
---------------------+--------------------
  Reporter:  purist  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.7.1
Resolution:          |   Keywords:
      Port:          |
---------------------+--------------------
Changes (by purist):

 * Attachment "config.log" added.

 $ ./configure

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Ticket URL: <https://trac.macports.org/ticket/64321>
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