Call configure on deps in separate rebar command that compile

This way we rebar.config.script can use vars detected by configure

Makefile.in

@@ -97,6 +97,7 @@ deps/.got:
 	$(REBAR) get-deps && :> deps/.got
 
 deps/.built: deps/.got
+	$(REBAR) recursive-deps
 	$(REBAR) compile && :> deps/.built
 
 src: deps/.built

plugins/configure_deps.erl

@@ -0,0 +1,5 @@
+-module(configure_deps).
+-export(['configure-deps'/2]).
+
+'configure-deps'(Config, Vals) ->
+  {ok, Config}.

plugins/override_opts.erl

@@ -2,13 +2,13 @@
 -export([preprocess/2]).
 
 override_opts(override, Config, Opts) ->
-    lists:foldl(fun({Opt, [Value]}, Conf) ->
+    lists:foldl(fun({Opt, Value}, Conf) ->
 			rebar_config:set(Conf, Opt, Value)
 		end, Config, Opts);
 override_opts(add, Config, Opts) ->
-    lists:foldl(fun({Opt, [Value]}, Conf) ->
+    lists:foldl(fun({Opt, Value}, Conf) ->
 			V = rebar_config:get_local(Conf, Opt, []),
-			rebar_config:set(Conf, Opt, [Value | V])
+			rebar_config:set(Conf, Opt, V ++ Value)
 		end, Config, Opts).
 
 preprocess(Config, _Dirs) ->

rebar.config

@@ -111,7 +111,7 @@
 
 {if_rebar3, {plugins, [rebar3_hex, {provider_asn1, "0.2.0"}]}}.
 {if_not_rebar3, {plugins, [
-                           deps_erl_opts, override_deps_versions, override_opts,
+                           deps_erl_opts, override_deps_versions, override_opts, configure_deps,
                            {if_var_true, elixir, rebar_elixir_compiler},
                            {if_var_true, elixir, rebar_exunit}
                           ]}}.
@@ -153,6 +153,7 @@
 
 {if_version_above, "17", {cover_enabled, true}}.
 {cover_export_enabled, true}.
+{recursive_cmds, ['configure-deps']}.
 
 {post_hook_configure, [{"fast_tls", []},
                        {"stringprep", []},

rebar.config.script

@@ -298,8 +298,8 @@ GenDepsConfigure =
 fun(Hooks) ->
 	lists:map(fun({Pkg, Flags}) ->
 			  DepPath = ResolveDepPath("deps/" ++ Pkg ++ "/"),
-			  {add, list_to_atom(Pkg), [{pre_hooks, [{'compile',
+			  Line = lists:flatten(GenDepConfigureLine(DepPath, Flags)),
-			   lists:flatten(GenDepConfigureLine(DepPath, Flags))}]}]}
+			  {add, list_to_atom(Pkg), [{pre_hooks, [{'compile', Line}, {'configure-deps', Line}]}]}
 		  end, Hooks)
 end,