import Lake open Lake DSL package REPL { -- add package configuration options here } lean_lib REPL { -- add library configuration options here } @[default_target] lean_exe repl where root := `REPL.Main supportInterpreter := true require mathlib from git "https://github.com/leanprover-community/mathlib4"@"3cecb823a74ed737c6ebc115e515eba649ec7715"