/usr/share/tcltk/tklib0.6/tkpiechart/ is in tklib 0.6-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/tcltk/tklib0.6/tkpiechart/boxlabel.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/canlabel.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/labarray.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/objselec.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/perilabel.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/pie.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/pielabel.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/pkgIndex.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/relirect.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/selector.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/slice.tcl
/usr/share/tcltk/tklib0.6/tkpiechart/tkpiechart.tcl