[MacPorts] #41414: VirtualBox @4.2.16_0 fails to configure on Marvericks

[MacPorts]

#41414: VirtualBox @4.2.16_0 fails to configure on Marvericks
------------------------+--------------------------------
 Reporter:  aruminat@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.2.1
 Keywords:              |       Port:  virtualbox
------------------------+--------------------------------
 This is newer VirtualBox from #41392.
 {{{
 $ port outdated |grep virtualbox
 virtualbox                     4.2.16_0 < 4.2.16_0  (platform darwin 11 !=
 darwin 13)
 }}}
 Then,
 {{{
 $ sudo port clean --all virtualbox && sudo port upgrade virtualbox
 [snip]
 --->  Configuring virtualbox
 Error: org.macports.configure for port virtualbox returned: configure
 failure: command execution failed
 }}}

 This is due to failing to determine Darwin version.

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Ticket URL: <https://trac.macports.org/ticket/41414>
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