[MacPorts] #55822: Upgrade outdated fails building libtorrent

[MacPorts]

#55822: Upgrade outdated fails building libtorrent
-------------------------+-------------------
  Reporter:  borgo1971   |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  libtorrent  |
-------------------------+-------------------
Description changed by mf2k:

Old description:

> I tried more time to upgrade outdated files (selfupdate says to do this),
> but can't end with success the procedure.
>
> $ sudo port upgrade outdated
> --->  Computing dependencies for libtorrent
> --->  Building libtorrent
> Error: Failed to build libtorrent: command execution failed
> Error: See
> /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libtorrent/libtorrent/main.log
> for details.
> Error: Follow https://guide.macports.org/#project.tickets to report a
> bug.
>
> MacPro 2009 with macOS 10.11.6

New description:

 I tried more time to upgrade outdated files (selfupdate says to do this),
 but can't end with success the procedure.
 {{{
 $ sudo port upgrade outdated
 --->  Computing dependencies for libtorrent
 --->  Building libtorrent
 Error: Failed to build libtorrent: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libtorrent/libtorrent/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 }}}
 MacPro 2009 with macOS 10.11.6

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Ticket URL: <https://trac.macports.org/ticket/55822#comment:2>
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