Lambdapi library used by the automated theorem prover ZenonModulo for generating Lambdapi proofs.
opam repository -a add lambdapi https://github.com/deducteam/opam-lambdapi-repository.git # once
opam install lambdapi-zenon
require open Stdlib.Prop Stdlib.Set Stdlib.Eq Stdlib.FOL Logic.Zenon.Main;
opam install --deps-only . # once
make
opam install .