[MacPorts] #54365: eigen3 fails to configure on Sierra

[MacPorts]

#54365: eigen3 fails to configure on Sierra
------------------------+----------------------
  Reporter:  TimArnold  |      Owner:  eborisch
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  Sierra
      Port:  eigen3     |
------------------------+----------------------
Description changed by mf2k:

Old description:

> --->  Configuring eigen3
> Error: Failed to configure eigen3: configure failure: command execution
> failed
> Error: See
> /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_eigen3/eigen3/main.log
> for details.
> Error: Follow https://guide.macports.org/#project.tickets to report a
> bug.
> Error: Processing of port gnudatalanguage failed

New description:

 {{{
 --->  Configuring eigen3
 Error: Failed to configure eigen3: configure failure: command execution
 failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_eigen3/eigen3/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 Error: Processing of port gnudatalanguage failed
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54365#comment:4>
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