[MacPorts] #56086: build of db 48-4.8.30_4 fails in MacPorts 2.4.2 on macOS Sierra 10.12.6

[MacPorts]

#56086: build of db 48-4.8.30_4 fails in MacPorts 2.4.2 on macOS Sierra 10.12.6
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  Reporter:  emsisson  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:  db48 failed verify signature
      Port:  db48      |
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Comment (by raimue):

 As indicated in the log file, your provider seems to tamper with your
 internet connection. See MisbehavingServers. This might also be related to
 corrupted downloads.

 I am a bit puzzled by the `Permission denied` error. The log shows that
 the `incoming` directory should be owned by the macports user, so there
 should be no problem accessing the file.

 In any case, a normal clean does not remove downloaded archives. Try
 `clean --all` to remove everything related to the build attempt of the
 port:
 {{{
 $ sudo port clean --all db48
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56086#comment:1>
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