postinst is in qalculate-gtk 0.9.9-1.
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 | #!/bin/sh
set -e
update-alternatives --install /usr/bin/qalculate qalculate \
/usr/bin/qalculate-gtk 20
|