diff --git a/gclient.py b/gclient.py
index ab52cc8ee..a91c61b32 100644
--- a/gclient.py
+++ b/gclient.py
@@ -172,6 +172,9 @@ class DependencySettings(GClientKeywords):
     # dependency.  It is read from the actual DEPS file so cannot be set on
     # class instantiation.
     self.recursion_override = None
+    # This is a mutable value which has the list of 'target_os' OSes listed in
+    # the current deps file.
+    self.local_target_os = None
 
     # These are only set in .gclient and not in DEPS files.
     self._custom_vars = custom_vars or {}
@@ -239,6 +242,13 @@ class DependencySettings(GClientKeywords):
       return self.recursion_override
     return max(self.parent.recursion_limit - 1, 0)
 
+  @property
+  def target_os(self):
+    if self.local_target_os is not None:
+      return tuple(set(self.local_target_os).union(self.parent.target_os))
+    else:
+      return self.parent.target_os
+
   def get_custom_deps(self, name, url):
     """Returns a custom deps if applicable."""
     if self.parent:
@@ -455,13 +465,15 @@ class Dependency(gclient_utils.WorkItem, DependencySettings):
       self.recursion_override = local_scope.get('recursion')
       logging.warning(
           'Setting %s recursion to %d.', self.name, self.recursion_limit)
+    # If present, save 'target_os' in the local_target_os property.
+    if 'target_os' in local_scope:
+      self.local_target_os = local_scope['target_os']
     # load os specific dependencies if defined.  these dependencies may
     # override or extend the values defined by the 'deps' member.
     if 'deps_os' in local_scope:
-      enforced_os = self.root.enforced_os
-      for deps_os_key in enforced_os:
+      for deps_os_key in self.target_os:
         os_deps = local_scope['deps_os'].get(deps_os_key, {})
-        if len(enforced_os) > 1:
+        if len(self.target_os) > 1:
           # Ignore any conflict when including deps for more than one
           # platform, so we collect the broadest set of dependencies
           # available. We may end up with the wrong revision of something for
@@ -1166,6 +1178,10 @@ solutions = [
     """How recursive can each dependencies in DEPS file can load DEPS file."""
     return self._recursion_limit
 
+  @property
+  def target_os(self):
+    return self._enforced_os
+
 
 #### gclient commands.
 
diff --git a/tests/gclient_test.py b/tests/gclient_test.py
index 801f784f1..5481dbdf1 100755
--- a/tests/gclient_test.py
+++ b/tests/gclient_test.py
@@ -307,6 +307,45 @@ class GclientTest(trial_dir.TestCase):
     obj = gclient.GClient.LoadCurrentConfig(options)
     self.assertEqual(['baz', 'unix'], sorted(obj.enforced_os))
 
+  def testTargetOsInDepsFile(self):
+    """Verifies that specifying a target_os value in a DEPS file pulls in all
+    relevant dependencies.
+
+    The target_os variable in a DEPS file allows specifying the name of an
+    additional OS which should be considered when selecting dependencies from a
+    DEPS' deps_os. The value will be appended to the _enforced_os tuple.
+    """
+
+    write(
+        '.gclient',
+        'solutions = [\n'
+        '  { "name": "foo",\n'
+        '    "url": "svn://example.com/foo",\n'
+        '  }]\n')
+    write(
+        os.path.join('foo', 'DEPS'),
+        'target_os = ["baz"]\n'
+        'deps_os = {\n'
+        '  "unix": { "foo/unix": "/unix", },\n'
+        '  "baz": { "foo/baz": "/baz", },\n'
+        '  "jaz": { "foo/jaz": "/jaz", },\n'
+        '}')
+
+    parser = gclient.Parser()
+    options, _ = parser.parse_args(['--jobs', '1'])
+    options.deps_os = 'unix'
+
+    obj = gclient.GClient.LoadCurrentConfig(options)
+    obj.RunOnDeps('None', [])
+    self.assertEqual(['unix'], sorted(obj.enforced_os))
+    self.assertEquals(
+        [
+          'svn://example.com/foo',
+          'svn://example.com/foo/baz',
+          'svn://example.com/foo/unix',
+          ],
+        sorted(self._get_processed()))
+
   def testRecursionOverride(self):
     """Verifies gclient respects the recursion var syntax.