postinst is in fort77 1.15-10.
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 | #!/bin/sh -e
update-alternatives --install /usr/bin/f77 f77 /usr/bin/fort77 10 --slave /usr/share/man/man1/f77.1.gz f77.1.gz /usr/share/man/man1/fort77.1.gz
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