preinst is in gnustep-back-common 0.24.0-4.
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 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ]; then
rm -rf /var/lib/GNUstep/Fonts/*
fi
exit 0
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