As of MariaDB 5.5 PBXT is not built by default any longer.
The commands to use for building the MariaDB 5.5 source with PBXT:
cmake -DWITH_PBXT_STORAGE_ENGINE=1 . make make install
It should be noted that MariaDB still ships the engine, it just does not build it by default.
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Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/building-pbxt/