Install libghc-haddock-library-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-haddock-library-doc
Description:
library exposing some functionality of Haddock; documentation
Haddock is a documentation-generation tool for Haskell libraries. These modules expose some functionality of it without pulling in the GHC dependency. . For interacting with Haddock itself, see the ‘haddock’ package. . 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://www.haskell.org/haddock/
Version: 1.4.3-1
Section: universe/doc