postinst is in webkit-image-qt 0.0.svn25399-3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28  | #!/bin/sh
# postinst script for webkit-image-qt
#
# see: dh_installdeb(1)
set -e
mandir=/usr/share/man
case "$1" in
    configure)
        if [ -f /usr/bin/webkit-image-qt ]; then
            update-alternatives --install /usr/bin/webkit-image \
                webkit-image /usr/bin/webkit-image-qt 100 \
                --slave $mandir/man1/webkit-image.1.gz webkit-image.1.gz \
                $mandir/man1/webkit-image-qt.1.gz
        fi
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
exit 0
 |