Install libghc-exact-pi-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-exact-pi-dev
Description:
Exact rational multiples of pi (and integer powers of pi)
Provides an exact representation for rational multiples of pi alongside an approximate representation of all reals. Useful for storing and computing with conversion factors between physical units. . This package provides a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: https://github.com/dmcclean/exact-pi/
Version: 0.4.1.2-3build1
Section: universe/haskell