diff --git a/plugins/override_opts.erl b/plugins/override_opts.erl
index 1d321fc87..818f53e87 100644
--- a/plugins/override_opts.erl
+++ b/plugins/override_opts.erl
@@ -9,6 +9,11 @@ override_opts(add, Config, Opts) ->
     lists:foldl(fun({Opt, Value}, Conf) ->
 			V = rebar_config:get_local(Conf, Opt, []),
 			rebar_config:set(Conf, Opt, V ++ Value)
+		end, Config, Opts);
+override_opts(del, Config, Opts) ->
+    lists:foldl(fun({Opt, Value}, Conf) ->
+			V = rebar_config:get_local(Conf, Opt, []),
+			rebar_config:set(Conf, Opt, V -- Value)
 		end, Config, Opts).
 
 preprocess(Config, _Dirs) ->
@@ -24,6 +29,8 @@ preprocess(Config, _Dirs) ->
 		      lists:foldl(fun({Type, AppName2, Opts}, Conf1) when
 					    AppName2 == AppName ->
 					  override_opts(Type, Conf1, Opts);
+				     ({Type, Opts}, Conf1a) ->
+					  override_opts(Type, Conf1a, Opts);
 				     (_, Conf2) ->
 					  Conf2
 				  end, C, TopOverrides);
diff --git a/rebar.config b/rebar.config
index acf3ebb02..08042444d 100644
--- a/rebar.config
+++ b/rebar.config
@@ -148,6 +148,9 @@
 {cover_export_enabled, true}.
 {recursive_cmds, ['configure-deps']}.
 
+{overrides, [
+  {del, [{erl_opts, [warnings_as_errors]}]}]}.
+
 {post_hook_configure, [{"fast_tls", []},
                        {"stringprep", []},
                        {"fast_yaml", []},
diff --git a/rebar.config.script b/rebar.config.script
index 694d6879f..0023c25f3 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -299,7 +299,7 @@ fun(Hooks) ->
 	lists:map(fun({Pkg, Flags}) ->
 			  DepPath = ResolveDepPath("deps/" ++ Pkg ++ "/"),
 			  Line = lists:flatten(GenDepConfigureLine(DepPath, Flags)),
-			  {add, list_to_atom(Pkg), [{pre_hooks, [{'compile', Line}, {'configure-deps', Line}]}]}
+			  {add, list_to_atom(Pkg), [{pre_hooks, [{{pc, compile}, Line}, {'compile', Line}, {'configure-deps', Line}]}]}
 		  end, Hooks)
 end,