/usr/include/ITK-4.10/linpack/ is in libinsighttoolkit4-dev 4.10.1-dfsg1-1.1+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ITK-4.10/linpack/cqrdc.h
/usr/include/ITK-4.10/linpack/cqrsl.h
/usr/include/ITK-4.10/linpack/csvdc.h
/usr/include/ITK-4.10/linpack/dpoco.h
/usr/include/ITK-4.10/linpack/dpodi.h
/usr/include/ITK-4.10/linpack/dpofa.h
/usr/include/ITK-4.10/linpack/dposl.h
/usr/include/ITK-4.10/linpack/dqrdc.h
/usr/include/ITK-4.10/linpack/dqrsl.h
/usr/include/ITK-4.10/linpack/dsvdc.h
/usr/include/ITK-4.10/linpack/sqrdc.h
/usr/include/ITK-4.10/linpack/sqrsl.h
/usr/include/ITK-4.10/linpack/ssvdc.h
/usr/include/ITK-4.10/linpack/zqrdc.h
/usr/include/ITK-4.10/linpack/zqrsl.h
/usr/include/ITK-4.10/linpack/zsvdc.h