postinst is in liblua50-dev 5.0.3-8.
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 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
# For now, just update the alternatives set to include us.
update-alternatives --install /usr/bin/lua-config lua-configuration /usr/bin/lua-config50 80 --slave /usr/share/man/man1/lua-config.1.gz lua-configuration-manual /usr/share/man/man1/lua-config50.1.gz
fi # Configure
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