Horizon Haskell Packages
Put this in your cabal.project.
repository horizon
url: https://packages.horizon-haskell.net/
secure: True
root-keys:
29b2edcf288217a83d29e59ad7bd32f854697392489651147fc13aecbd02c14e
565119309501f67e66ae7d465f799a579c88e4e0929605b6a6cf08ae05e3977c
6e9e65a9b9c819be8d3e7e7f949c795d930c9d0e3ebc6b92b449a6033b231420