keep plugins dir as deps dir when compiling plugins+deps

src/rebar_plugins.erl

@@ -94,7 +94,8 @@ build_plugin(AppInfo, Apps, State) ->
     Providers = rebar_state:providers(State),
     Providers1 = rebar_state:providers(rebar_app_info:state(AppInfo)),
     S = rebar_state:all_deps(rebar_app_info:state_or_new(State, AppInfo), Apps),
-    rebar_prv_compile:compile(S, Providers++Providers1, AppInfo).
+    S1 = rebar_state:set(S, deps_dir, ?DEFAULT_PLUGINS_DIR),
+    rebar_prv_compile:compile(S1, Providers++Providers1, AppInfo).
 
 plugin_providers({Plugin, _, _, _}) when is_atom(Plugin) ->
     validate_plugin(Plugin);