preinst is in libdirectfb-dev 1.2.10.0-8+deb9u1.
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
# handle symlink to directory conversion
DOCDIR=/usr/share/doc/libdirectfb-dev
if [ -L $DOCDIR ] ; then
rm $DOCDIR
fi
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