[MacPorts] #56057: smartmontools: requires C++11

[MacPorts]

#56057: smartmontools: requires C++11
--------------------+---------------------------
 Reporter:  mojca   |      Owner:  RJVB
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  smartmontools
--------------------+---------------------------
 Smartmontools does not compile on older systems due to lack of some C++11
 functionality.

 On 10.5 PPC using `configure.compiler=macports-gcc-6` helped to build the
 port successfully.

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Ticket URL: <https://trac.macports.org/ticket/56057>
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