Install libghc-cpphs-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-cpphs-doc
Description:
cpphs-library for haskell; documentation
This package provides some of the features of cpphs as a haskell library. . This package contains the API documentation for this library
Homepage: http://projects.haskell.org/cpphs/
Version: 1.20.8-1
Section: universe/doc