postinst is in tachyon-bin-nox 0.99~b6+dsx-4.
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 | #!/bin/sh
set -e
VARIANT=nox
add_variant_alternative () {
	local variant=$1
	local priority=$2
	update-alternatives \
		--install /usr/bin/tachyon tachyon /usr/bin/tachyon-${variant} $priority \
		--slave /usr/share/man/man1/tachyon.1.gz tachyon.1.gz /usr/share/man/man1/tachyon-${variant}.1.gz
	return 0
	}
case $VARIANT in
	nox) add_variant_alternative nox  10 ;;
	ogl) add_variant_alternative ogl 100 ;;
	*) echo "unknown variant \'${VARIANT}': skip" >&2 ;;
esac
exit 0
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