let star =   let url = "https://github.com/alexdobin/STAR/archive/STAR_2.4.1d.tar.gz" in   let star_binary = "STAR" in   (* TODO: there are other binaries in `bin/` *)   let star_binary_path = sprintf "bin/Linux_x86_64/%s" star_binary in   Installable_tool.make ~url Machine.Tool.Default.star     ~init_program:add_to_dollar_path     ~unarchived_directory:"STAR-*"     ~install_program:KEDSL.Program.(fun ~path ->         shf "cp %s %s" star_binary_path path)     ~witness:(witness_file star_binary)