/usr/ is in libopenblas-dev 0.2.20+ds-4.
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..
/usr/include/
/usr/include/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/openblas/liblapack.a
/usr/lib/x86_64-linux-gnu/openblas/liblapack.so
/usr/include/x86_64-linux-gnu/cblas-openblas.h
/usr/include/x86_64-linux-gnu/f77blas.h
/usr/include/x86_64-linux-gnu/openblas_config.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libopenblasp-r0.2.20.a
/usr/lib/x86_64-linux-gnu/openblas/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/blas-openblas.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/lapack-openblas.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/openblas.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libopenblas-dev/
/usr/share/doc/libopenblas-dev/copyright
/usr/lib/x86_64-linux-gnu/libopenblas.a
/usr/lib/x86_64-linux-gnu/libopenblas.so
/usr/lib/x86_64-linux-gnu/openblas/libblas.a
/usr/lib/x86_64-linux-gnu/openblas/libblas.so
/usr/share/doc/libopenblas-dev/changelog.Debian.gz