[MacPorts] #42130: invalid command name "configure.cxx_stdlib"

[MacPorts]

#42130: invalid command name "configure.cxx_stdlib"
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 Reporter:  jkhartshorne@…  |      Owner:  macports-tickets@…
     Type:  defect          |     Status:  new
 Priority:  High            |  Milestone:
Component:  ports           |    Version:  2.2.1
 Keywords:                  |       Port:
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 I am trying to install Boost as follows:

 sudo port -s install boost +no_static +python27 configure.compiler
 =macports-gcc-4.8 configure.cxx_stdlib=libc++

 I'm getting this error:

 Error: Unable to open port: invalid command name "configure.cxx_stdlib"
 Error: Unable to execute port: upgrade zlib failed

 I recently upgraded to Mavericks. I followed the MacPort migration page,
 deleting all old ports and reinstalling the ones I thought I needed. I
 reinstalled gcc and clang, but maybe I'm still missing something I need?
 I've run port selfupdate a few times, which has not solved the problem.

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Ticket URL: <https://trac.macports.org/ticket/42130>
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