[MacPorts] #53549: Error: org.macports.configure for port libssh returned: configure failure: command execution failed

[MacPorts]

#53549: Error: org.macports.configure for port libssh returned: configure failure:
command execution failed
----------------------+-------------------
  Reporter:  ppiseri  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.3
Resolution:           |   Keywords:  tiger
      Port:  libssh   |
----------------------+-------------------

Comment (by kencu):

 I wonder if you have something in `/usr/local/include`. You can check this
 in several ways, `open /usr/local/include` or `ls -la
 /usr/local/include/*`.

 If you do, that is your problem. Macports compilers look there before they
 look in `/usr/local`, and that causes lots of troubles if you have
 something in there (although it can be useful if you use it correctly).

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Ticket URL: <https://trac.macports.org/ticket/53549#comment:8>
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