Embelish rebar's config a bit.

rebar.config

@@ -1,6 +1,39 @@
 %%-*- mode: erlang -*-
 %% ex: ft=erlang ts=4 sw=4 et
-{port_specs, [{"priv/wterl.so", ["c_src/*.c"]}]}.
+
+{require_otp_vsn, "R1[456]"}.
+
+{cover_enabled, true}.
+
+{eunit_opts, [verbose, {report, {eunit_surefire, [{dir, "."}]}}]}.
+
+{erl_opts, [%{d,'DEBUG',true},
+            debug_info,
+            fail_on_warning,
+            warn_unused_vars,
+            warn_export_all,
+            warn_shadow_vars,
+            warn_unused_import,
+            warn_unused_function,
+            warn_bif_clash,
+            warn_unused_record,
+            warn_deprecated_function,
+            warn_obsolete_guard,
+            warn_export_vars,
+            warn_exported_vars,
+            warn_untyped_record,
+            {parse_transform, lager_transform}
+            %warn_missing_spec,
+            %strict_validation
+            ]}.
+
+{xref_checks, [undefined_function_calls]}.
+
+{deps, [
+	{lager, "2.*", {git, "git://github.com/basho/lager", {branch, "master"}}}
+       ]}.
+
+{port_specs, [{"priv/wt.so", ["c_src/*.c"]}]}.
 
 {port_env, [
             {"DRV_CFLAGS",  "$DRV_CFLAGS -Werror -I c_src/system/include"},