/usr/lib/tcltk/Memchan2.3/pkgIndex.tcl is in tcl-memchan 2.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | package ifneeded Memchan 2.3 \
[list load [file join $dir libMemchan2.3.so]]
|