let provide ~run_program ~host ~install_path it =
  let install_workflow =
    install_tool ~run_program ~host ~install_path it in
  let export_var =
    match it.tool_type with
    | `Application -> None
    | `Library v   ->
      let path = install_workflow#product#shell_which in
      Some KEDSL.Program.(shf "export %s=\"%s${%s:+:}${%s}\"" v path v v)
  in
  Machine.Tool.create it.definition
    ~ensure:install_workflow
    ~init:KEDSL.Program.(
        (if it.requires_conda
         then Conda.init_biokepi_env ~install_path
         else sh "echo 'Does not need Conda'")
        && it.init_environment ~install_path
        && Opam.kcom ~root_name:(Opam.root_of_package it.package) ~install_path
          (shf "eval $(%s)") "config env"
        && Option.value export_var ~default:(sh "echo 'No export var'")
      )