diff --git a/googlemock/cmake/gmock.pc.in b/googlemock/cmake/gmock.pc.in
index 2ef0fbca..08e04547 100644
--- a/googlemock/cmake/gmock.pc.in
+++ b/googlemock/cmake/gmock.pc.in
@@ -1,5 +1,6 @@
-libdir=@CMAKE_INSTALL_FULL_LIBDIR@
-includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+prefix=${pcfiledir}/../..
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: gmock
 Description: GoogleMock (without main() function)
diff --git a/googlemock/cmake/gmock_main.pc.in b/googlemock/cmake/gmock_main.pc.in
index 04658fe2..b22fe614 100644
--- a/googlemock/cmake/gmock_main.pc.in
+++ b/googlemock/cmake/gmock_main.pc.in
@@ -1,5 +1,6 @@
-libdir=@CMAKE_INSTALL_FULL_LIBDIR@
-includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+prefix=${pcfiledir}/../..
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: gmock_main
 Description: GoogleMock (with main() function)
diff --git a/googletest/cmake/gtest.pc.in b/googletest/cmake/gtest.pc.in
index e7967ad5..9aae29e2 100644
--- a/googletest/cmake/gtest.pc.in
+++ b/googletest/cmake/gtest.pc.in
@@ -1,5 +1,6 @@
-libdir=@CMAKE_INSTALL_FULL_LIBDIR@
-includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+prefix=${pcfiledir}/../..
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: gtest
 Description: GoogleTest (without main() function)
diff --git a/googletest/cmake/gtest_main.pc.in b/googletest/cmake/gtest_main.pc.in
index fe25d9c7..915f2973 100644
--- a/googletest/cmake/gtest_main.pc.in
+++ b/googletest/cmake/gtest_main.pc.in
@@ -1,5 +1,6 @@
-libdir=@CMAKE_INSTALL_FULL_LIBDIR@
-includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+prefix=${pcfiledir}/../..
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: gtest_main
 Description: GoogleTest (with main() function)
diff --git a/googletest/include/gtest/internal/gtest-internal.h b/googletest/include/gtest/internal/gtest-internal.h
index 0fe05e23..9d1d8634 100644
--- a/googletest/include/gtest/internal/gtest-internal.h
+++ b/googletest/include/gtest/internal/gtest-internal.h
@@ -1176,6 +1176,112 @@ class NativeArray {
   GTEST_DISALLOW_ASSIGN_(NativeArray);
 };
 
+// Backport of std::index_sequence.
+template <size_t... Is>
+struct IndexSequence {
+  using type = IndexSequence;
+};
+
+// Double the IndexSequence, and one if plus_one is true.
+template <bool plus_one, typename T, size_t sizeofT>
+struct DoubleSequence;
+template <size_t... I, size_t sizeofT>
+struct DoubleSequence<true, IndexSequence<I...>, sizeofT> {
+  using type = IndexSequence<I..., (sizeofT + I)..., 2 * sizeofT>;
+};
+template <size_t... I, size_t sizeofT>
+struct DoubleSequence<false, IndexSequence<I...>, sizeofT> {
+  using type = IndexSequence<I..., (sizeofT + I)...>;
+};
+
+// Backport of std::make_index_sequence.
+// It uses O(ln(N)) instantiation depth.
+template <size_t N>
+struct MakeIndexSequence
+    : DoubleSequence<N % 2 == 1, typename MakeIndexSequence<N / 2>::type,
+                     N / 2>::type {};
+
+template <>
+struct MakeIndexSequence<0> : IndexSequence<> {};
+
+// FIXME: This implementation of ElemFromList is O(1) in instantiation depth,
+// but it is O(N^2) in total instantiations. Not sure if this is the best
+// tradeoff, as it will make it somewhat slow to compile.
+template <typename T, size_t, size_t>
+struct ElemFromListImpl {};
+
+template <typename T, size_t I>
+struct ElemFromListImpl<T, I, I> {
+  using type = T;
+};
+
+// Get the Nth element from T...
+// It uses O(1) instantiation depth.
+template <size_t N, typename I, typename... T>
+struct ElemFromList;
+
+template <size_t N, size_t... I, typename... T>
+struct ElemFromList<N, IndexSequence<I...>, T...>
+    : ElemFromListImpl<T, N, I>... {};
+
+template <typename... T>
+class FlatTuple;
+
+template <typename Derived, size_t I>
+struct FlatTupleElemBase;
+
+template <typename... T, size_t I>
+struct FlatTupleElemBase<FlatTuple<T...>, I> {
+  using value_type =
+      typename ElemFromList<I, typename MakeIndexSequence<sizeof...(T)>::type,
+                            T...>::type;
+  FlatTupleElemBase() = default;
+  explicit FlatTupleElemBase(value_type t) : value(std::move(t)) {}
+  value_type value;
+};
+
+template <typename Derived, typename Idx>
+struct FlatTupleBase;
+
+template <size_t... Idx, typename... T>
+struct FlatTupleBase<FlatTuple<T...>, IndexSequence<Idx...>>
+    : FlatTupleElemBase<FlatTuple<T...>, Idx>... {
+  using Indices = IndexSequence<Idx...>;
+  FlatTupleBase() = default;
+  explicit FlatTupleBase(T... t)
+      : FlatTupleElemBase<FlatTuple<T...>, Idx>(std::move(t))... {}
+};
+
+// Analog to std::tuple but with different tradeoffs.
+// This class minimizes the template instantiation depth, thus allowing more
+// elements that std::tuple would. std::tuple has been seen to require an
+// instantiation depth of more than 10x the number of elements in some
+// implementations.
+// FlatTuple and ElemFromList are not recursive and have a fixed depth
+// regardless of T...
+// MakeIndexSequence, on the other hand, it is recursive but with an
+// instantiation depth of O(ln(N)).
+template <typename... T>
+class FlatTuple
+    : private FlatTupleBase<FlatTuple<T...>,
+                            typename MakeIndexSequence<sizeof...(T)>::type> {
+  using Indices = typename FlatTuple::FlatTupleBase::Indices;
+
+ public:
+  FlatTuple() = default;
+  explicit FlatTuple(T... t) : FlatTuple::FlatTupleBase(std::move(t)...) {}
+
+  template <size_t I>
+  const typename ElemFromList<I, Indices, T...>::type& Get() const {
+    return static_cast<const FlatTupleElemBase<FlatTuple, I>*>(this)->value;
+  }
+
+  template <size_t I>
+  typename ElemFromList<I, Indices, T...>::type& Get() {
+    return static_cast<FlatTupleElemBase<FlatTuple, I>*>(this)->value;
+  }
+};
+
 }  // namespace internal
 }  // namespace testing
 
diff --git a/googletest/include/gtest/internal/gtest-param-util.h b/googletest/include/gtest/internal/gtest-param-util.h
index 2dea63cc..d5d4da95 100644
--- a/googletest/include/gtest/internal/gtest-param-util.h
+++ b/googletest/include/gtest/internal/gtest-param-util.h
@@ -74,27 +74,6 @@ namespace internal {
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 // Utility Functions
 
-// Block of code creating for_each_in_tuple
-template <int... Is>
-struct sequence {};
-
-template <int N, int... Is>
-struct generate_sequence : generate_sequence<N - 1, N - 1, Is...> {};
-
-template <int... Is>
-struct generate_sequence<0, Is...> : sequence<Is...> {};
-
-template <typename T, typename F, int... Is>
-void ForEachInTupleImpl(T&& t, F f_gtest, sequence<Is...>) {
-  int l[] = {(f_gtest(std::get<Is>(t)), 0)...};
-  (void)l;  // silence "unused variable warning"
-}
-template <typename... T, typename F>
-void ForEachInTuple(const std::tuple<T...>& t, F f_gtest) {
-  internal::ForEachInTupleImpl(t, f_gtest,
-                               internal::generate_sequence<sizeof...(T)>());
-}
-
 // Outputs a message explaining invalid registration of different
 // fixture class for the same test case. This may happen when
 // TEST_P macro is used to define two tests with the same name
@@ -747,30 +726,23 @@ internal::ParamGenerator<typename Container::value_type> ValuesIn(
 namespace internal {
 // Used in the Values() function to provide polymorphic capabilities.
 
-template <typename T>
-struct PushBack {
-  template <typename U>
-  void operator()(const U& u) {
-    v_.push_back(static_cast<T>(u));
-  }
-  std::vector<T>& v_;
-};
-
 template <typename... Ts>
 class ValueArray {
  public:
   ValueArray(Ts... v) : v_{std::move(v)...} {}
 
-  template <typename Tn>
-  operator ParamGenerator<Tn>() const {
-    std::vector<Tn> vc_accumulate;
-    PushBack<Tn> fnc{vc_accumulate};
-    ForEachInTuple(v_, fnc);
-    return ValuesIn(std::move(vc_accumulate));
+  template <typename T>
+  operator ParamGenerator<T>() const {  // NOLINT
+    return ValuesIn(MakeVector<T>(MakeIndexSequence<sizeof...(Ts)>()));
   }
 
  private:
-  std::tuple<Ts...> v_;
+  template <typename T, size_t... I>
+  std::vector<T> MakeVector(IndexSequence<I...>) const {
+    return std::vector<T>{static_cast<T>(v_.template Get<I>())...};
+  }
+
+  FlatTuple<Ts...> v_;
 };
 
 }  // namespace internal
diff --git a/googletest/test/googletest-env-var-test.py b/googletest/test/googletest-env-var-test.py
index e1efeee1..2f0e406a 100755
--- a/googletest/test/googletest-env-var-test.py
+++ b/googletest/test/googletest-env-var-test.py
@@ -45,8 +45,8 @@ environ = os.environ.copy()
 
 def AssertEq(expected, actual):
   if expected != actual:
-    print 'Expected: %s' % (expected,)
-    print '  Actual: %s' % (actual,)
+    print('Expected: %s' % (expected,))
+    print('  Actual: %s' % (actual,))
     raise AssertionError
 
 
diff --git a/googletest/test/googletest-filter-unittest.py b/googletest/test/googletest-filter-unittest.py
index dc0b5bd9..6b32f2d2 100755
--- a/googletest/test/googletest-filter-unittest.py
+++ b/googletest/test/googletest-filter-unittest.py
@@ -42,7 +42,10 @@ we test that here also.
 
 import os
 import re
-import sets
+try:
+  from sets import Set as set  # For Python 2.3 compatibility
+except ImportError:
+  pass
 import sys
 import gtest_test_utils
 
@@ -57,7 +60,7 @@ CAN_PASS_EMPTY_ENV = False
 if sys.executable:
   os.environ['EMPTY_VAR'] = ''
   child = gtest_test_utils.Subprocess(
-      [sys.executable, '-c', 'import os; print \'EMPTY_VAR\' in os.environ'])
+      [sys.executable, '-c', 'import os; print(\'EMPTY_VAR\' in os.environ)'])
   CAN_PASS_EMPTY_ENV = eval(child.output)
 
 
@@ -72,7 +75,7 @@ if sys.executable:
   os.environ['UNSET_VAR'] = 'X'
   del os.environ['UNSET_VAR']
   child = gtest_test_utils.Subprocess(
-      [sys.executable, '-c', 'import os; print \'UNSET_VAR\' not in os.environ'
+      [sys.executable, '-c', 'import os; print(\'UNSET_VAR\' not in os.environ)'
       ])
   CAN_UNSET_ENV = eval(child.output)
 
@@ -245,14 +248,14 @@ class GTestFilterUnitTest(gtest_test_utils.TestCase):
     for slice_var in list_of_sets:
       full_partition.extend(slice_var)
     self.assertEqual(len(set_var), len(full_partition))
-    self.assertEqual(sets.Set(set_var), sets.Set(full_partition))
+    self.assertEqual(set(set_var), set(full_partition))
 
   def AdjustForParameterizedTests(self, tests_to_run):
     """Adjust tests_to_run in case value parameterized tests are disabled."""
 
     global param_tests_present
     if not param_tests_present:
-      return list(sets.Set(tests_to_run) - sets.Set(PARAM_TESTS))
+      return list(set(tests_to_run) - set(PARAM_TESTS))
     else:
       return tests_to_run
 
diff --git a/googletest/test/googletest-output-test.py b/googletest/test/googletest-output-test.py
index 2d69e353..1a9ee6e3 100755
--- a/googletest/test/googletest-output-test.py
+++ b/googletest/test/googletest-output-test.py
@@ -287,7 +287,7 @@ class GTestOutputTest(gtest_test_utils.TestCase):
     # sequences when we read the golden file irrespective of an operating
     # system used. Therefore, we need to strip those \r's from newlines
     # unconditionally.
-    golden = ToUnixLineEnding(golden_file.read())
+    golden = ToUnixLineEnding(golden_file.read().decode())
     golden_file.close()
 
     # We want the test to pass regardless of certain features being
diff --git a/googletest/test/googletest-throw-on-failure-test.py b/googletest/test/googletest-throw-on-failure-test.py
index 46cb9f6d..204e43e7 100755
--- a/googletest/test/googletest-throw-on-failure-test.py
+++ b/googletest/test/googletest-throw-on-failure-test.py
@@ -68,7 +68,7 @@ def SetEnvVar(env_var, value):
 def Run(command):
   """Runs a command; returns True/False if its exit code is/isn't 0."""
 
-  print 'Running "%s". . .' % ' '.join(command)
+  print('Running "%s". . .' % ' '.join(command))
   p = gtest_test_utils.Subprocess(command)
   return p.exited and p.exit_code == 0
 
diff --git a/googletest/test/googletest-uninitialized-test.py b/googletest/test/googletest-uninitialized-test.py
index 5b7d1e74..69595a0d 100755
--- a/googletest/test/googletest-uninitialized-test.py
+++ b/googletest/test/googletest-uninitialized-test.py
@@ -43,8 +43,8 @@ def Assert(condition):
 
 def AssertEq(expected, actual):
   if expected != actual:
-    print 'Expected: %s' % (expected,)
-    print '  Actual: %s' % (actual,)
+    print('Expected: %s' % (expected,))
+    print('  Actual: %s' % (actual,))
     raise AssertionError
 
 
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index c6280ca2..9aff4f04 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -7450,6 +7450,84 @@ TEST(NativeArrayTest, WorksForTwoDimensionalArray) {
   EXPECT_EQ(a, na.begin());
 }
 
+// IndexSequence
+TEST(IndexSequence, MakeIndexSequence) {
+  using testing::internal::IndexSequence;
+  using testing::internal::MakeIndexSequence;
+  EXPECT_TRUE(
+      (std::is_same<IndexSequence<>, MakeIndexSequence<0>::type>::value));
+  EXPECT_TRUE(
+      (std::is_same<IndexSequence<0>, MakeIndexSequence<1>::type>::value));
+  EXPECT_TRUE(
+      (std::is_same<IndexSequence<0, 1>, MakeIndexSequence<2>::type>::value));
+  EXPECT_TRUE((
+      std::is_same<IndexSequence<0, 1, 2>, MakeIndexSequence<3>::type>::value));
+  EXPECT_TRUE(
+      (std::is_base_of<IndexSequence<0, 1, 2>, MakeIndexSequence<3>>::value));
+}
+
+// ElemFromList
+TEST(ElemFromList, Basic) {
+  using testing::internal::ElemFromList;
+  using Idx = testing::internal::MakeIndexSequence<3>::type;
+  EXPECT_TRUE((
+      std::is_same<int, ElemFromList<0, Idx, int, double, char>::type>::value));
+  EXPECT_TRUE(
+      (std::is_same<double,
+                    ElemFromList<1, Idx, int, double, char>::type>::value));
+  EXPECT_TRUE(
+      (std::is_same<char,
+                    ElemFromList<2, Idx, int, double, char>::type>::value));
+  EXPECT_TRUE(
+      (std::is_same<
+          char, ElemFromList<7, testing::internal::MakeIndexSequence<12>::type,
+                             int, int, int, int, int, int, int, char, int, int,
+                             int, int>::type>::value));
+}
+
+// FlatTuple
+TEST(FlatTuple, Basic) {
+  using testing::internal::FlatTuple;
+
+  FlatTuple<int, double, const char*> tuple = {};
+  EXPECT_EQ(0, tuple.Get<0>());
+  EXPECT_EQ(0.0, tuple.Get<1>());
+  EXPECT_EQ(nullptr, tuple.Get<2>());
+
+  tuple = FlatTuple<int, double, const char*>(7, 3.2, "Foo");
+  EXPECT_EQ(7, tuple.Get<0>());
+  EXPECT_EQ(3.2, tuple.Get<1>());
+  EXPECT_EQ(std::string("Foo"), tuple.Get<2>());
+
+  tuple.Get<1>() = 5.1;
+  EXPECT_EQ(5.1, tuple.Get<1>());
+}
+
+TEST(FlatTuple, ManyTypes) {
+  using testing::internal::FlatTuple;
+
+  // Instantiate FlatTuple with 257 ints.
+  // Tests show that we can do it with thousands of elements, but very long
+  // compile times makes it unusuitable for this test.
+#define GTEST_FLAT_TUPLE_INT8 int, int, int, int, int, int, int, int,
+#define GTEST_FLAT_TUPLE_INT16 GTEST_FLAT_TUPLE_INT8 GTEST_FLAT_TUPLE_INT8
+#define GTEST_FLAT_TUPLE_INT32 GTEST_FLAT_TUPLE_INT16 GTEST_FLAT_TUPLE_INT16
+#define GTEST_FLAT_TUPLE_INT64 GTEST_FLAT_TUPLE_INT32 GTEST_FLAT_TUPLE_INT32
+#define GTEST_FLAT_TUPLE_INT128 GTEST_FLAT_TUPLE_INT64 GTEST_FLAT_TUPLE_INT64
+#define GTEST_FLAT_TUPLE_INT256 GTEST_FLAT_TUPLE_INT128 GTEST_FLAT_TUPLE_INT128
+
+  // Let's make sure that we can have a very long list of types without blowing
+  // up the template instantiation depth.
+  FlatTuple<GTEST_FLAT_TUPLE_INT256 int> tuple;
+
+  tuple.Get<0>() = 7;
+  tuple.Get<99>() = 17;
+  tuple.Get<256>() = 1000;
+  EXPECT_EQ(7, tuple.Get<0>());
+  EXPECT_EQ(17, tuple.Get<99>());
+  EXPECT_EQ(1000, tuple.Get<256>());
+}
+
 // Tests SkipPrefix().
 
 TEST(SkipPrefixTest, SkipsWhenPrefixMatches) {
diff --git a/googletest/test/gtest_xml_output_unittest.py b/googletest/test/gtest_xml_output_unittest.py
index faedd4e6..8669f19e 100755
--- a/googletest/test/gtest_xml_output_unittest.py
+++ b/googletest/test/gtest_xml_output_unittest.py
@@ -266,7 +266,8 @@ class GTestXMLOutputUnitTest(gtest_xml_test_utils.GTestXMLTestCase):
         'gtest_no_test_unittest')
     try:
       os.remove(output_file)
-    except OSError, e:
+    except OSError:
+      e = sys.exc_info()[1]
       if e.errno != errno.ENOENT:
         raise
 
diff --git a/googletest/test/gtest_xml_test_utils.py b/googletest/test/gtest_xml_test_utils.py
index 1e035859..afcf55e0 100755
--- a/googletest/test/gtest_xml_test_utils.py
+++ b/googletest/test/gtest_xml_test_utils.py
@@ -94,7 +94,7 @@ class GTestXMLTestCase(gtest_test_utils.TestCase):
     self.assertEquals(
         len(expected_children), len(actual_children),
         'number of child elements differ in element ' + actual_node.tagName)
-    for child_id, child in expected_children.iteritems():
+    for child_id, child in expected_children.items():
       self.assert_(child_id in actual_children,
                    '<%s> is not in <%s> (in element %s)' %
                    (child_id, actual_children, actual_node.tagName))