diff --git a/calculate/vars/install/os/__init__.py b/calculate/vars/install/os/__init__.py
new file mode 100644
index 0000000..b977023
--- /dev/null
+++ b/calculate/vars/install/os/__init__.py
@@ -0,0 +1,10 @@
+import os
+from calculate.variables.datavars import Variable, Namespace, Dependence, \
+    StringType, BooleanType, HashType, Calculate, Copy
+from calculate.vars.main.os.func import get_arch_gentoo
+
+with Namespace("arch"):
+    Variable("machine", type=StringType,
+        source=Copy("main.os.arch.machine"))
+    Variable("gentoo", type=StringType,
+        source=Calculate(get_arch_gentoo, ".machine"))
diff --git a/calculate/vars/main/os/__init__.py b/calculate/vars/main/os/__init__.py
new file mode 100644
index 0000000..e226b54
--- /dev/null
+++ b/calculate/vars/main/os/__init__.py
@@ -0,0 +1,9 @@
+from calculate.variables.datavars import Variable, Namespace, Dependence, \
+    StringType, BooleanType, HashType, Calculate
+from .func import *
+
+with Namespace("arch"):
+    Variable("machine", type=StringType,
+        source=Calculate(get_arch_machine))
+    Variable("gentoo", type=StringType,
+        source=Calculate(get_arch_gentoo, ".machine"))
diff --git a/calculate/vars/main/os/func.py b/calculate/vars/main/os/func.py
new file mode 100644
index 0000000..d42632b
--- /dev/null
+++ b/calculate/vars/main/os/func.py
@@ -0,0 +1,14 @@
+import re
+import platform
+
+def get_arch_machine():
+    return platform.machine()
+
+def get_arch_gentoo(arch_machine):
+    arch = arch_machine.value
+    if re.search("i.86", arch):
+        return "x86"
+    else:
+        return {
+            "x86_64": "amd64"
+        }.get(arch,arch)
diff --git a/tests/vars/test_vars.py b/tests/vars/test_vars.py
index 348431f..46e87e8 100644
--- a/tests/vars/test_vars.py
+++ b/tests/vars/test_vars.py
@@ -1,6 +1,7 @@
 import pytest
 import calculate.vars.main.os.x11 as main_os_x11
 import calculate.vars.main.cl as main_cl
+import calculate.vars.main.os as main_os
 from calculate.vars.main.cl import CmdlineParams
 import mock
 from itertools import chain
@@ -90,3 +91,27 @@ def test_main_cl_cmdline(case):
     with mock.patch('calculate.vars.main.cl.readFile') as readFile:
         readFile.return_value = case["data"]
         assert main_cl.get_calculate_cmdline() == case["result"]
+
+
+@pytest.mark.parametrize('case',
+    [
+        {
+            "source": "i686",
+            "result": "x86"
+        },
+        {
+            "source": "i386",
+            "result": "x86"
+        },
+        {
+            "source": "x86_64",
+            "result": "amd64"
+        },
+    ],
+    ids=lambda x:"{}->{}".format(x["source"],x["result"]))
+@pytest.mark.calculate_vars
+def test_main_os_get_arch_gentoo(case):
+    class Var:
+        def __init__(self, value):
+            self.value = value
+    assert main_os.get_arch_gentoo(Var(case["source"])) == case["result"]