postinst is in fcmp 1.18.20030311-3.
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 | #!/bin/sh
set -e
update-alternatives --quiet --install /usr/share/games/freecraft/default \
freecraft-data /usr/share/games/freecraft/fcmp 10
##
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