/usr/ is in librelion+mpi-dev 1.4+dfsg-1build1.
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..
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/librelion-1.4.a
/usr/lib/x86_64-linux-gnu/pkgconfig/relion-1.4.pc
/usr/lib/x86_64-linux-gnu/librelion-1.4.la
/usr/include/
/usr/include/relion-1.4/
/usr/include/relion-1.4/src/
/usr/include/relion-1.4/src/mpi.h
/usr/include/relion-1.4/src/ml_optimiser_mpi.h
/usr/include/relion-1.4/src/particle_polisher_mpi.h
/usr/include/relion-1.4/src/ctffind_runner_mpi.h
/usr/include/relion-1.4/src/autopicker_mpi.h
/usr/include/relion-1.4/src/preprocessing_mpi.h
/usr/include/relion-1.4/src/particle_sorter_mpi.h
/usr/share/
/usr/share/doc/
/usr/share/doc/librelion+mpi-dev/
/usr/share/doc/librelion+mpi-dev/copyright
/usr/lib/x86_64-linux-gnu/librelion-1.4.so
/usr/share/doc/librelion+mpi-dev/changelog.Debian.gz