preinst is in autoconf2.13 2.13-61.
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 -e
for d in autoconf autoheader autoreconf; do
dpkg-divert --package autoconf2.13 --add --rename \
--divert /usr/bin/${d}2.50 /usr/bin/${d}
dpkg-divert --package autoconf2.13 --add --rename \
--divert /usr/share/man/man1/${d}2.50.1.gz \
/usr/share/man/man1/${d}.1.gz
done
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