prerm is in fvwm-crystal 3.3.1+dfsg-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.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
if [ "$1" != "upgrade" ]; then
update-alternatives --remove x-window-manager /usr/bin/fvwm-crystal
fi
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