/usr/lib/tcltk/xapian1.2.8/pkgIndex.tcl is in tclxapian 1.2.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | package ifneeded xapian 1.2.8 [list load [file join $dir xapian[info sharedlibextension]]]
|