diff --git a/bin/brb.ml b/bin/brb.ml
index 7b64bcf..3fc243a 100644
--- a/bin/brb.ml
+++ b/bin/brb.ml
@@ -2,9 +2,10 @@ open Common
 
 
 let () =
-  let specs = [("--only-deps", Arg.Set Barbra.only_deps,
+  let only_deps = ref false and force_build = ref false in
+  let specs = [("--only-deps", Arg.Set only_deps,
                 "Act on dependencies only, ignoring project sources");
-               ("--force", Arg.Set Barbra.force_build,
+               ("--force", Arg.Set force_build,
                 "Force build, even if the '_dep' directory already exists")]
   in
 
@@ -13,8 +14,8 @@ let () =
     ~synopsis:"Build the project in the current directory"
     ~help:("Assumes that '_dep' directory doesn't exist or contains\n" ^
               "*already* built dependencies, listed in 'brb.conf'.")
-    Barbra.build
-  in SubCommand.register ({ scmd with SubCommand.specs = specs })
+    (fun () -> Barbra.build ~only_deps:!only_deps ~force_build:!force_build)
+  in SubCommand.(register { scmd with specs = specs })
 and () = SubCommand.register & SubCommand.make
   ~name:"clean"
   ~synopsis:"Remove '_dep' directory with built dependencies"
@@ -24,6 +25,14 @@ and () = SubCommand.register & SubCommand.make
   ~synopsis:"Fetch the latest 'purse' full of fresh recipes!"
   ~help:"Clones or updates 'purse' repository in $HOME/.brb/recipes."
   Barbra.update
+and () =
+  let arg = ref "" in
+  let cmd = SubCommand.make
+    ~name:"install"
+    ~synopsis:"Install a single recipe to the '_dep' directory"
+    ~usage:"recipe"
+    (fun () -> Barbra.install !arg)
+  in SubCommand.(register { cmd with anon = (:=) arg })
 and () =
   let args = ref [] in
   let cmd = SubCommand.make
diff --git a/src/barbra.ml b/src/barbra.ml
index 94a19f2..c42533d 100644
--- a/src/barbra.ml
+++ b/src/barbra.ml
@@ -3,23 +3,11 @@ open Common
 
 include Global
 
-let only_deps   = ref false
-let force_build = ref false
+(* Internal. *)
 
-(** [with_config f] Executes a given function, passing parsed config
-    file as an argument. *)
-let with_config f =
-  let conf = base_dir </> brb_conf in
-  if Sys.file_exists conf then
-    f (Config.from_file conf)
-  else
-    Log.error "can't find brb.conf in %S" base_dir
-
-(* assuming we are in project's root dir *)
-let rec build_deps () =
-  let rec go = function
-    | [] -> Log.info "Dependencies built successfully!"
-    | ({ name; package; _ } as dep) :: conf ->
+let build_deps = let rec go = function
+  | [] -> Log.info "Dependencies built successfully!"
+  | ({ name; package; _ } as dep) :: conf ->
       let go_temp_dir project_path =
         go & { dep with package = Temporary (`Directory, project_path) }
           :: conf
@@ -81,7 +69,7 @@ let rec build_deps () =
         | Installed | Recipe _ ->
           go conf
       end
-  in with_config go
+  in go
 
 and build_project () = begin
   Log.info "Building the project (from %S)" base_dir;
@@ -94,11 +82,17 @@ and build_project () = begin
   Log.info "Project built successfully!"
 end
 
-and build () =
-  if not (Filew.is_directory dep_dir) || !force_build then begin
+(* Public API. *)
+
+let rec build ~only_deps ~force_build =
+  let conf_path = base_dir </> brb_conf in
+  if not (Filew.is_file conf_path) then
+    Log.error "can't find %s in %S" brb_conf base_dir;
+
+  if not (Filew.is_directory dep_dir) || force_build then begin
     cleanup ();
-    build_deps ();
-    if not !only_deps then
+    build_deps (Config.from_file conf_path);
+    if not only_deps then
       build_project ()
   end
 
@@ -118,5 +112,8 @@ and update () =
       exec_exn ["git"; "clone"; "https://github.com/camlunity/purse.git";
                 recipe_dir]
 
+and install _recipe =
+  ()
+
 and run_with_env cmd =
   Res.exn_res (Env.exec_with_env cmd)