[MacPorts] #44346: Selfupdate fails with Undefined symbols for architecture x86_64: "_rl_username_completion_function"

[MacPorts]

#44346: Selfupdate fails with Undefined symbols for architecture x86_64:
"_rl_username_completion_function"
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  Reporter:  bugmail-macports@…  |      Owner:  macports-tickets@…
      Type:  defect              |     Status:  closed
  Priority:  Normal              |  Milestone:
 Component:  base                |    Version:  2.3.1
Resolution:  worksforme          |   Keywords:
      Port:                      |
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Comment (by manuel.nuno.melo@…):

 Maybe too little too late, but I faced the exact same problem and the
 reason was that /usr/bin/cc was pointing to /opt/local/bin/gcc (and
 therefore the MacPorts readline was always being preferred over the
 /usr/lib one).

 I imagine I did that linking myself at some point (duh!). Serves me right
 for being messy...
 Making /usr/bin/cc point to /usr/bin/gcc solved the problem.

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Ticket URL: <https://trac.macports.org/ticket/44346#comment:7>
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