diff --git a/bootstrap b/bootstrap
index 5f57d2c..9916324 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1,5 +1,6 @@
 #!/usr/bin/env escript
-%% -*- erlang -*-
+%% -*- tab-width: 4;erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ft=erlang ts=4 sw=4 et
 
 main(Args) ->
     %% Get a string repr of build time
diff --git a/src/rebar_erlc_compiler.erl b/src/rebar_erlc_compiler.erl
index 51b7f17..c41b96d 100644
--- a/src/rebar_erlc_compiler.erl
+++ b/src/rebar_erlc_compiler.erl
@@ -106,13 +106,20 @@ inspect(Source, IncludePath) ->
 -spec inspect_epp(Epp::pid(), Module::string(), Includes::[string()]) -> {string(), [string()]}.
 inspect_epp(Epp, Module, Includes) ->
     case epp:parse_erl_form(Epp) of
-        {ok, {attribute, _, module, ActualModule}} ->
-            %% If the module name includes package info, we get a list of atoms...
-            case is_list(ActualModule) of
-                true ->
+        {ok, {attribute, _, module, ModInfo}} ->
+            case ModInfo of
+                %% Typical module name, single atom
+                ActualModule when is_atom(ActualModule) ->
+                    ActualModuleStr = atom_to_list(ActualModule);
+                %% Packag-ized module name, list of atoms
+                ActualModule when is_list(ActualModule) ->
                     ActualModuleStr = string:join([atom_to_list(P) || P <- ActualModule], ".");
-                false ->
-                    ActualModuleStr = atom_to_list(ActualModule)
+                %% Parameterized module name, single atom
+                {ActualModule, _} when is_atom(ActualModule) ->
+                    ActualModuleStr = atom_to_list(ActualModule);
+                %% Parameterized and packagized module name, list of atoms
+                {ActualModule, _} when is_list(ActualModule) ->
+                    ActualModuleStr = string:join([atom_to_list(P) || P <- ActualModule], ".")
             end,
             inspect_epp(Epp, ActualModuleStr, Includes);
         {ok, {attribute, 1, file, {Module, 1}}} ->
diff --git a/src/rebar_port_compiler.erl b/src/rebar_port_compiler.erl
index a347cb7..b08a046 100644
--- a/src/rebar_port_compiler.erl
+++ b/src/rebar_port_compiler.erl
@@ -253,7 +253,9 @@ default_env() ->
                                      " -I", filename:join(erts_dir(), include),
                                      " "])},
      {"DRIVER_LDFLAGS", lists:concat([" -L", code:lib_dir(erl_interface, lib),
-                                      " -lerl_interface -lei"])}].
+                                      " -lerl_interface -lei"])},
+     {"ERLANG_ARCH", integer_to_list(8 * erlang:system_info(wordsize))},
+     {"ERLANG_TARGET", rebar_utils:get_arch()}].
 
 
 
diff --git a/src/rebar_utils.erl b/src/rebar_utils.erl
index 7265058..1e99caa 100644
--- a/src/rebar_utils.erl
+++ b/src/rebar_utils.erl
@@ -28,6 +28,7 @@
 
 -export([get_cwd/0,
          is_arch/1,
+         get_arch/0,
          get_os/0,
          sh/2, sh/3,
          sh_failfast/2,
@@ -48,14 +49,17 @@ get_cwd() ->
 
 
 is_arch(ArchRegex) ->
-    Arch = erlang:system_info(system_architecture),
-    case re:run(Arch, ArchRegex, [{capture, none}]) of
+    case re:run(get_arch(), ArchRegex, [{capture, none}]) of
         match ->
             true;
         nomatch ->
             false
     end.
 
+get_arch() ->
+    Words = integer_to_list(8 * erlang:system_info(wordsize)),
+    erlang:system_info(system_architecture) ++ "-" ++ Words.
+
 get_os() ->
     Arch = erlang:system_info(system_architecture),
     case match_first([{"linux", linux}, {"darwin", darwin}], Arch) of