Install libghc-icalendar-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-icalendar-doc
Description:
iCalendar data types, parser, and printer; documentation
Data definitions, parsing and printing of the iCalendar format (RFC5545). . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: http://github.com/chrra/iCalendar
Version: 0.4.0.3-4build5
Section: universe/doc