This file is indexed.

postinst is in libwxgtk3.0-dev 3.0.4+dfsg-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.

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#!/bin/sh
set -e

update-alternatives --install /usr/bin/wx-config wx-config            \
			      /usr/lib/x86_64-linux-gnu/wx/config/gtk2-unicode-3.0  \
			      $(( 30 * 10 + 8 ))