/usr/lib/tcltk/x86_64-linux-gnu/tk8.6/pkgIndex.tcl is in libtk8.6 8.6.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | if {[catch {package present Tcl 8.6.0}]} return
package ifneeded Tk 8.6.5 [list load [file normalize [file join /usr/lib/x86_64-linux-gnu libtk8.6.so]] Tk]
|