diff --git a/c_src/config.c b/c_src/config.c
index 2a07529..5634a02 100644
--- a/c_src/config.c
+++ b/c_src/config.c
@@ -57,7 +57,7 @@ geef_config_set_bool(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 	ErlNifBinary bin;
 	int error, val;
 	ERL_NIF_TERM ret;
-	
+
 	ret = extract(&cfg, &bin, env, argv);
 	if (ret != atoms.ok)
 		return ret;
@@ -80,7 +80,7 @@ geef_config_get_bool(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 	ErlNifBinary bin;
 	int error, val;
 	ERL_NIF_TERM ret;
-	
+
 	ret = extract(&cfg, &bin, env, argv);
 	if (ret != atoms.ok)
 		return ret;
@@ -100,10 +100,10 @@ geef_config_set_int(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 {
 	geef_config *cfg;
 	ErlNifBinary bin;
-	int64_t val;
+	ErlNifSInt64 val;
 	int error;
 	ERL_NIF_TERM ret;
-	
+
 	ret = extract(&cfg, &bin, env, argv);
 	if (ret != atoms.ok)
 		return ret;
diff --git a/lib/geef/object.ex b/lib/geef/object.ex
index b2a5d12..4845d52 100644
--- a/lib/geef/object.ex
+++ b/lib/geef/object.ex
@@ -1,6 +1,10 @@
 require Record
 
 defmodule Geef.Object do
+  @behaviour Access
+  alias Geef.Object
+  alias Geef.Tree
+
   defstruct type: nil, id: nil, handle: nil
 
   def lookup(repo, id) do
@@ -32,4 +36,24 @@ defmodule Geef.Object do
     end
   end
 
+  def fetch(tree = %Object{type: :tree}, key) when is_number(key) do
+    Tree.nth(tree, key)
+  end
+
+  def fetch(tree = %Object{type: :tree}, key) do
+    Tree.get(tree, key)
+  end
+
+  def get(tree = %Object{type: :tree}, key) do
+    case fetch(tree, key) do
+      {:ok, entry} -> entry
+      {:error, _} -> nil
+    end
+  end
+
+  # Git data is immutable
+  def get_and_update(_tree, _key, _fun) do
+    raise ArgumentError
+  end
+
 end
diff --git a/lib/geef/tree.ex b/lib/geef/tree.ex
index 854e695..a0500e4 100644
--- a/lib/geef/tree.ex
+++ b/lib/geef/tree.ex
@@ -33,31 +33,6 @@ defmodule Geef.Tree do
 
 end
 
-defimpl Access, for: Geef.Object do
-  alias Geef.Object
-  alias Geef.Tree
-
-  def get(tree = %Object{type: :tree}, key) when is_number(key) do
-    case Tree.nth(tree, key) do
-      {:ok, entry} -> entry
-      {:error, _} -> nil
-    end
-  end
-
-  def get(tree = %Object{type: :tree}, key) do
-    case Tree.get(tree, key) do
-      {:ok, entry} -> entry
-      {:error, _} -> nil
-    end
-  end
-
-  # Git data is immutable
-  def get_and_update(_tree, _key, _fun) do
-    raise ArgumentError
-  end
-
-end
-
 defmodule Geef.TreeError do
   defexception [reason: nil]
 
diff --git a/mix.exs b/mix.exs
index 7c40c6e..17a9752 100644
--- a/mix.exs
+++ b/mix.exs
@@ -10,7 +10,7 @@ defmodule Mix.Tasks.Compile.Nif do
     `["c_src"]`. Can be configured as:
 
     ````
-    [ptahs: ["c_src", "vendor/src"]]
+    [paths: ["c_src", "vendor/src"]]
     ````
 
   * `:exts` - extensions of the source files. Defaults to `[:c]`, can
@@ -118,7 +118,7 @@ defmodule Geef.Mixfile do
   end
 
   def nif do
-    [ file: "priv/geef.so",
+    [ file: "#{Path.join [__DIR__, "priv", "geef.so"]}",
       flags: "-lgit2" ]
   end
 
diff --git a/src/geef_sig.erl b/src/geef_sig.erl
index 91e8f38..f149b74 100644
--- a/src/geef_sig.erl
+++ b/src/geef_sig.erl
@@ -24,7 +24,7 @@ default(Repo) ->
 %% @doc Create a signature with the specified username and email, with
 %% a timestamp of now
 now(Name, Email) ->
-    Now = now(),
+    Now = os:timestamp(),
     %% We ask two questions "what's the time here?" and "what's the
     %% time in UTC-Land?". The difference in minutes is our offset.
     Local = calendar:datetime_to_gregorian_seconds(calendar:now_to_local_time(Now)),
diff --git a/test/config_test.erl b/test/config_test.erl
index 6db03fe..f1c7832 100644
--- a/test/config_test.erl
+++ b/test/config_test.erl
@@ -8,7 +8,7 @@ config_test_() ->
 					fun string_test/1]}.
 
 start() ->
-    {A, B, C} = now(),
+    {A, B, C} = os:timestamp(),
     N = node(),
     TmpFile = io_lib:format("/tmp/geef-~p~p~p~p.gitconfig", [N, A, B, C]),
     {ok, Config} = geef_config:open(TmpFile),
diff --git a/test/repo_test.erl b/test/repo_test.erl
index 581f47d..3d6cf15 100644
--- a/test/repo_test.erl
+++ b/test/repo_test.erl
@@ -11,7 +11,7 @@ repo_test_() ->
 					fun commit_tree_test/1]}.
 
 start() ->
-    {A, B, C} = now(),
+    {A, B, C} = os:timestamp(),
     N = node(),
     TmpDir = io_lib:format("/tmp/geef-~p~p~p~p.git", [N, A, B, C]),
     {ok, Repo} = geef_repo:init(TmpDir, true),