/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/ is in libpetsc-complex-3.7.7-dbg 3.7.7+dfsg1-2build5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdm.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmcomposite.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmda.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmhide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmplex.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmplexdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmredundant.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdmshell.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdt.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdtdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscdthide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscis.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscisdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscishide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscksp.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petsckspdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscksphide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscmat.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscmatdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscmathide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscpc.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscpcdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscpchide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscsnes.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscsnesdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscsneshide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscts.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petsctsdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petsctshide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscvec.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscvecdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscvechide.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscviewer.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscviewerdef.h90
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex-debug/include/petsc/finclude/ftn-custom/petscviewerhide.h90