[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"
---------------------------------+--------------------------------
  Reporter:  bugmail-macports@…  |      Owner:  macports-tickets@…
      Type:  defect              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  base                |    Version:  2.3.1
Resolution:                      |   Keywords:
      Port:                      |
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Comment (by cal@…):

 Well, you can use the installer from our website to update to 2.3.1 for
 now, but you'll likely hit the same problem again with the next update.

 Note that `readline.o` isn't the offending file in `/usr/local`,
 `readline.h` in `/usr/local/include` and/or `libreadline.*.dylib` in
 `/usr/local/lib` are. Please check for these files.

 If that doesn't help, what's the output of `openssl dgst -sha1
 /usr/include/readline.h` and `nm /usr/lib/libreadline.dylib`?

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Ticket URL: <https://trac.macports.org/ticket/44346#comment:1>
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