Install libghc-sdl-ttf-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-sdl-ttf-doc
Description:
Haskell SDL TTF binding for GHC - documentation
This package provides the documentation for the SDL TTF library bindings for the Haskell programming language. SDL TTF allows you to use TrueType fonts in SDL applications.
Homepage: http://hackage.haskell.org/package/SDL-ttf
Version: 0.6.2-8build3
Section: universe/doc