libplist violates mtree when system python is selected

[ryandesign (Ryan Carsten Schmidt)]

--->  Computing dependencies for libplist
--->  Fetching archive for libplist
--->  Attempting to fetch libplist-1.8_0+universal.darwin_10.i386-x86_64.tbz2 from http://packages.macports.org/libplist
--->  Fetching libplist
--->  Attempting to fetch libplist-1.8.tar.bz2 from http://distfiles.macports.org/libplist
--->  Verifying checksum(s) for libplist
--->  Extracting libplist
--->  Configuring libplist
--->  Building libplist
--->  Staging libplist into destroot
Warning: violation by /Library/Python
Warning: libplist violates the layout of the ports-filesystems!
Warning: Please fix or indicate this misbehavior (if it is intended), it will be an error in future releases!
--->  Installing libplist @1.8_0+universal
--->  Cleaning libplist
--->  Computing dependencies for libplist
--->  Deactivating libplist @1.4_0+universal
--->  Activating libplist @1.8_0+universal
--->  Cleaning libplist
--->  Uninstalling libplist @1.4_0+universal

$ port contents libplist
Port libplist contains:
  /Library/Python/2.6/site-packages/plist/__init__.py
  /Library/Python/2.6/site-packages/plist/_plist.so
  /Library/Python/2.6/site-packages/plist/plist.py
  /opt/local/bin/plutil
  /opt/local/bin/plutil-1.8
  /opt/local/include/plist/Array.h
  /opt/local/include/plist/Boolean.h
  /opt/local/include/plist/Data.h
  /opt/local/include/plist/Date.h
  /opt/local/include/plist/Dictionary.h
  /opt/local/include/plist/Integer.h
  /opt/local/include/plist/Node.h
  /opt/local/include/plist/Real.h
  /opt/local/include/plist/String.h
  /opt/local/include/plist/Structure.h
  /opt/local/include/plist/plist++.h
  /opt/local/include/plist/plist.h
  /opt/local/include/plist/swig/plist.i
  /opt/local/lib/libplist++.1.1.8.dylib
  /opt/local/lib/libplist++.1.dylib
  /opt/local/lib/libplist++.dylib
  /opt/local/lib/libplist.1.1.8.dylib
  /opt/local/lib/libplist.1.dylib
  /opt/local/lib/libplist.dylib
  /opt/local/lib/pkgconfig/libplist++.pc
  /opt/local/lib/pkgconfig/libplist.pc

$ which python
/usr/bin/python

[ryandesign (Ryan Carsten Schmidt)]

This is basically a further consequence of #27094 and would presumably be resolved by resolving that ticket.