This file is indexed.

postinst is in gambc 4.2.8-1.1.

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

if [ "$1" = configure ]; then
   update-alternatives \
       --install /usr/bin/scheme-r5rs scheme-r5rs /usr/bin/gsi 20 \
       --slave /usr/share/man/man1/scheme-r5rs.1 \
               scheme-r5rs.1 \
               /usr/share/man/man1/gsi.1.gz
fi