[MacPorts] #63371: base port: Adding extra configure options breaks readline build

[MacPorts]

#63371: base port: Adding extra configure options breaks readline build
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  Reporter:  snowflake  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.7.99
Resolution:             |   Keywords:
      Port:             |
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Comment (by jmroot):

 Building against things in the same prefix you're building base for is
 always going to be problematic. You at least need `--disable-flag-
 sanitization` for it to work, and you may find you end up using more
 things in the prefix than you wanted to.

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Ticket URL: <https://trac.macports.org/ticket/63371#comment:4>
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