[MacPorts] #55913: mariadb-10.2: fatal error: 'unordered_map' file not found

[MacPorts]

#55913: mariadb-10.2: fatal error: 'unordered_map' file not found
------------------------+--------------------------
 Reporter:  ryandesign  |      Owner:  pixilla
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  mariadb-10.2
------------------------+--------------------------
 mariadb-10.2 requires C++11. Earlier versions don't appear to. Including
 the cxx11 1.1 portgroup should help.

 https://build.macports.org/builders/ports-10.8_x86_64_legacy-
 builder/builds/52357

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Ticket URL: <https://trac.macports.org/ticket/55913>
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