/usr/include/ITK-4.5/lapack/double/ is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ITK-4.5/lapack/double/dgecon.h
/usr/include/ITK-4.5/lapack/double/dgeqr2.h
/usr/include/ITK-4.5/lapack/double/dgeqrf.h
/usr/include/ITK-4.5/lapack/double/dgerq2.h
/usr/include/ITK-4.5/lapack/double/dgesc2.h
/usr/include/ITK-4.5/lapack/double/dgetc2.h
/usr/include/ITK-4.5/lapack/double/dggbak.h
/usr/include/ITK-4.5/lapack/double/dggbal.h
/usr/include/ITK-4.5/lapack/double/dgges.h
/usr/include/ITK-4.5/lapack/double/dgghrd.h
/usr/include/ITK-4.5/lapack/double/dhgeqz.h
/usr/include/ITK-4.5/lapack/double/dlabad.h
/usr/include/ITK-4.5/lapack/double/dlacon.h
/usr/include/ITK-4.5/lapack/double/dlacpy.h
/usr/include/ITK-4.5/lapack/double/dladiv.h
/usr/include/ITK-4.5/lapack/double/dlae2.h
/usr/include/ITK-4.5/lapack/double/dlaev2.h
/usr/include/ITK-4.5/lapack/double/dlag2.h
/usr/include/ITK-4.5/lapack/double/dlagv2.h
/usr/include/ITK-4.5/lapack/double/dlange.h
/usr/include/ITK-4.5/lapack/double/dlanhs.h
/usr/include/ITK-4.5/lapack/double/dlanst.h
/usr/include/ITK-4.5/lapack/double/dlapy2.h
/usr/include/ITK-4.5/lapack/double/dlapy3.h
/usr/include/ITK-4.5/lapack/double/dlarf.h
/usr/include/ITK-4.5/lapack/double/dlarfb.h
/usr/include/ITK-4.5/lapack/double/dlarfg.h
/usr/include/ITK-4.5/lapack/double/dlarft.h
/usr/include/ITK-4.5/lapack/double/dlarnv.h
/usr/include/ITK-4.5/lapack/double/dlartg.h
/usr/include/ITK-4.5/lapack/double/dlaruv.h
/usr/include/ITK-4.5/lapack/double/dlascl.h
/usr/include/ITK-4.5/lapack/double/dlaset.h
/usr/include/ITK-4.5/lapack/double/dlasr.h
/usr/include/ITK-4.5/lapack/double/dlasrt.h
/usr/include/ITK-4.5/lapack/double/dlassq.h
/usr/include/ITK-4.5/lapack/double/dlasv2.h
/usr/include/ITK-4.5/lapack/double/dlaswp.h
/usr/include/ITK-4.5/lapack/double/dlatdf.h
/usr/include/ITK-4.5/lapack/double/dlatrs.h
/usr/include/ITK-4.5/lapack/double/dorg2r.h
/usr/include/ITK-4.5/lapack/double/dorgqr.h
/usr/include/ITK-4.5/lapack/double/dorgr2.h
/usr/include/ITK-4.5/lapack/double/dorm2r.h
/usr/include/ITK-4.5/lapack/double/dormqr.h
/usr/include/ITK-4.5/lapack/double/dormr2.h
/usr/include/ITK-4.5/lapack/double/drscl.h
/usr/include/ITK-4.5/lapack/double/dspr.h
/usr/include/ITK-4.5/lapack/double/dsptrf.h
/usr/include/ITK-4.5/lapack/double/dsptrs.h
/usr/include/ITK-4.5/lapack/double/dsteqr.h
/usr/include/ITK-4.5/lapack/double/dtgex2.h
/usr/include/ITK-4.5/lapack/double/dtgexc.h
/usr/include/ITK-4.5/lapack/double/dtgsen.h
/usr/include/ITK-4.5/lapack/double/dtgsy2.h
/usr/include/ITK-4.5/lapack/double/dtgsyl.h
/usr/include/ITK-4.5/lapack/double/dzsum1.h