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/usr/lib/tcltk/Img1.4.2/pkgIndex.tcl is in libtk-img 1:1.4.2-4ubuntu1.

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The actual contents of the file can be viewed below.

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# Tcl package index file
#
# Return if Tcl/Tk is old.
#
if {[package vcompare [info tclversion] 8.4] < 0} return

package ifneeded zlibtcl 1.2.8 \
    [list load [file join $dir libzlibtcl1.2.8.so]]
package ifneeded pngtcl 1.4.12 \
    [list load [file join $dir libpngtcl1.4.12.so]]
package ifneeded tifftcl 3.9.4 \
    [list load [file join $dir libtifftcl3.9.4.so]]
package ifneeded jpegtcl 8.4 \
    [list load [file join $dir libjpegtcl8.4.so]]
# -*- tcl -*- Tcl package index file
# --- --- --- Handcrafted, final generation by configure.
#
# $Id: pkgIndex.tcl.in 209 2009-03-03 17:19:05Z nijtmans $

package ifneeded img::base 1.4.2 [list load [file join $dir libtkimg1.4.2.so]]

# Compatibility hack. When asking for the old name of the package
# then load all format handlers and base libraries provided by tkImg.
# Actually we ask only for the format handlers, the required base
# packages will be loaded automatically through the usual package
# mechanism.

# When reading images without specifying it's format (option -format),
# the available formats are tried in reversed order as listed here.
# Therefore file formats with some "magic" identifier, which can be
# recognized safely, should be added at the end of this list.

package ifneeded Img 1.4.2 {
    package require img::window
    package require img::tga
    package require img::ico
    package require img::pcx
    package require img::sgi
    package require img::sun
    package require img::xbm
    package require img::xpm
    package require img::ps
    package require img::jpeg
    package require img::png
    package require img::tiff
    package require img::bmp
    package require img::ppm
    package require img::gif
    package require img::pixmap
    package provide Img 1.4.2
}

package ifneeded img::bmp 1.4.2 \
    [list load [file join $dir libtkimgbmp1.4.2.so]]
package ifneeded img::gif 1.4.2 \
    [list load [file join $dir libtkimggif1.4.2.so]]
package ifneeded img::ico 1.4.2 \
    [list load [file join $dir libtkimgico1.4.2.so]]
package ifneeded img::jpeg 1.4.2 \
    [list load [file join $dir libtkimgjpeg1.4.2.so]]
package ifneeded img::pcx 1.4.2 \
    [list load [file join $dir libtkimgpcx1.4.2.so]]
package ifneeded img::pixmap 1.4.2 \
    [list load [file join $dir libtkimgpixmap1.4.2.so]]
package ifneeded img::png 1.4.2 \
    [list load [file join $dir libtkimgpng1.4.2.so]]
package ifneeded img::ppm 1.4.2 \
    [list load [file join $dir libtkimgppm1.4.2.so]]
package ifneeded img::ps 1.4.2 \
    [list load [file join $dir libtkimgps1.4.2.so]]
package ifneeded img::sgi 1.4.2 \
    [list load [file join $dir libtkimgsgi1.4.2.so]]
package ifneeded img::sun 1.4.2 \
    [list load [file join $dir libtkimgsun1.4.2.so]]
package ifneeded img::tga 1.4.2 \
    [list load [file join $dir libtkimgtga1.4.2.so]]
package ifneeded img::tiff 1.4.2 \
    [list load [file join $dir libtkimgtiff1.4.2.so]]
package ifneeded img::window 1.4.2 \
    [list load [file join $dir libtkimgwindow1.4.2.so]]
package ifneeded img::xbm 1.4.2 \
    [list load [file join $dir libtkimgxbm1.4.2.so]]
package ifneeded img::xpm 1.4.2 \
    [list load [file join $dir libtkimgxpm1.4.2.so]]
package ifneeded img::dted 1.4.2 \
    [list load [file join $dir libtkimgdted1.4.2.so]]
package ifneeded img::raw 1.4.2 \
    [list load [file join $dir libtkimgraw1.4.2.so]]