/usr/lib/slepcdir/ is in libslepc3.1-dev 3.1-p6.dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/slepcdir/3.1/
/usr/lib/slepcdir/3.1/conf/
/usr/lib/slepcdir/3.1/conf/slepc_common
/usr/lib/slepcdir/3.1/conf/slepc_common_rules
/usr/lib/slepcdir/3.1/conf/slepc_common_variables
/usr/lib/slepcdir/3.1/include/
/usr/lib/slepcdir/3.1/include/finclude/
/usr/lib/slepcdir/3.1/include/finclude/slepc.h
/usr/lib/slepcdir/3.1/include/finclude/slepc.h90
/usr/lib/slepcdir/3.1/include/finclude/slepcdef.h
/usr/lib/slepcdir/3.1/include/finclude/slepceps.h
/usr/lib/slepcdir/3.1/include/finclude/slepceps.h90
/usr/lib/slepcdir/3.1/include/finclude/slepcepsdef.h
/usr/lib/slepcdir/3.1/include/finclude/slepcip.h
/usr/lib/slepcdir/3.1/include/finclude/slepcip.h90
/usr/lib/slepcdir/3.1/include/finclude/slepcipdef.h
/usr/lib/slepcdir/3.1/include/finclude/slepcqep.h
/usr/lib/slepcdir/3.1/include/finclude/slepcqep.h90
/usr/lib/slepcdir/3.1/include/finclude/slepcqepdef.h
/usr/lib/slepcdir/3.1/include/finclude/slepcst.h
/usr/lib/slepcdir/3.1/include/finclude/slepcst.h90
/usr/lib/slepcdir/3.1/include/finclude/slepcstdef.h
/usr/lib/slepcdir/3.1/include/finclude/slepcsvd.h
/usr/lib/slepcdir/3.1/include/finclude/slepcsvd.h90
/usr/lib/slepcdir/3.1/include/finclude/slepcsvddef.h
/usr/lib/slepcdir/3.1/include/finclude/slepcsys.h
/usr/lib/slepcdir/3.1/include/private/
/usr/lib/slepcdir/3.1/include/private/epsimpl.h
/usr/lib/slepcdir/3.1/include/private/ipimpl.h
/usr/lib/slepcdir/3.1/include/private/qepimpl.h
/usr/lib/slepcdir/3.1/include/private/slepcimpl.h
/usr/lib/slepcdir/3.1/include/private/stimpl.h
/usr/lib/slepcdir/3.1/include/private/svdimpl.h
/usr/lib/slepcdir/3.1/include/slepc.h
/usr/lib/slepcdir/3.1/include/slepcblaslapack.h
/usr/lib/slepcdir/3.1/include/slepceps.h
/usr/lib/slepcdir/3.1/include/slepcip.h
/usr/lib/slepcdir/3.1/include/slepcqep.h
/usr/lib/slepcdir/3.1/include/slepcst.h
/usr/lib/slepcdir/3.1/include/slepcsvd.h
/usr/lib/slepcdir/3.1/include/slepcsys.h
/usr/lib/slepcdir/3.1/include/slepcvec.h
/usr/lib/slepcdir/3.1/include/slepcversion.h
/usr/lib/slepcdir/3.1/include/src/
/usr/lib/slepcdir/3.1/include/src/eps/
/usr/lib/slepcdir/3.1/include/src/eps/impls/
/usr/lib/slepcdir/3.1/include/src/eps/impls/arpack/
/usr/lib/slepcdir/3.1/include/src/eps/impls/arpack/arpackp.h
/usr/lib/slepcdir/3.1/include/src/eps/impls/blopex/
/usr/lib/slepcdir/3.1/include/src/eps/impls/blopex/slepc-interface.h
/usr/lib/slepcdir/3.1/lib/
/usr/lib/slepcdir/3.1/lib/libO
/usr/lib/slepcdir/3.1/lib/libO_c++
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/conf/
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/conf/configure.log
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/conf/make.log
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/conf/slepcrules
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/conf/slepcvariables
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/include/
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/lib/
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/lib/libslepc.a
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/lib/libslepc.so
/usr/lib/slepcdir/3.1/linux-gnu-c-opt/lib/libslepc.so.3.1