Install libghc-fgl-prof by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-fgl-prof
Description:
Haskell graph library for GHC; profiling libraries
This is Martin Erwig's Functional Graph Library. . This package provides a library for the Haskell programming language, compiled for profiling. See http://www.haskell.org/ for more information on Haskell.
Homepage: http://hackage.haskell.org/package/fgl
Version: 5.5.4.0-1
Section: universe/haskell