postinst is in liblapack-dev 3.3.1-1.
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 12 13 14 15 16 17 18 | #! /bin/sh
set -e
update-alternatives --install /usr/lib/liblapack.so liblapack.so /usr/lib/lapack/liblapack.so 20 \
--slave /usr/lib/liblapack.a liblapack.a /usr/lib/lapack/liblapack.a
# Remove previous (deprecated) alternatives
# See bug #576801
update-alternatives --remove liblapackgf-3.a /usr/lib/liblapack.a
update-alternatives --remove liblapackgf-3.so /usr/lib/liblapack.so
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
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