preinst is in libsidl-dev 1.4.0.dfsg-8.2.
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 | #!/bin/sh -e
# Remove this self-referential symlink if it's there
if [ -L /usr/include/c ]; then
rm -f /usr/include/c;
fi
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