MF22 r20874: Changed the default search path for Boost to /usr. More and more              Linux distributions are including Boost, and this change in the              default lookup path can make for one less option to have to pass              to the configure script.
MF22 r20874: Changed the default search path for Boost to /usr. More and more
             Linux distributions are including Boost, and this change in the
             default lookup path can make for one less option to have to pass
             to the configure script.


git-svn-id: a341ccba1312b2efdbe34f40faf90581f48aa49f@20875 08b38cba-cd3b-11de-854e-f91c5b6e4272

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