prerm is in libpetsc3.4.2-dev 3.4.2.dfsg1-6.
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 11 | #!/bin/sh -e
# Remove alternatives links
if [ "$1" = "remove" ]; then
update-alternatives --remove petsc /usr/lib/petscdir/3.4.2
update-alternatives --remove math-blaslapack.m4 /usr/lib/petscdir/3.4.2/aclocal/math-blaslapack.m4
# Somewhat inelegant, but there's no test for empty dir
if [ -z "`ls /usr/share/aclocal`" ]; then
rmdir /usr/share/aclocal
fi
fi
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