[MacPorts] #58998: port @2.5.99 fails to build a port - in this case ldns.

[MacPorts]

#58998: port @2.5.99 fails to build a port - in this case ldns.
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  Reporter:  snowflake  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.5.99
Resolution:             |   Keywords:
      Port:             |
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Comment (by snowflake):

 Replying to [comment:3 satraul]:
 >
 > Your guess of that the CLT is out of date is plausible to why
 {{{-isysroot}}} is empty. It might be that libtool finds the SDK path
 using {{{xcrun}}} which is known to output an empty string on old versions
 (though it should be a non-zero ouput)

 My command line tools according to mpstats is "clt_version":
 "8.2.0.0.1.1480973914"

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Ticket URL: <https://trac.macports.org/ticket/58998#comment:4>
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