diff --git a/.travis.yml b/.travis.yml
index 9db3bca0..0528f49d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,11 +11,6 @@ os:
   - linux
   - osx
 
-branches:
-  only:
-    - master
-    - develop
-
 env:
   matrix:
     - BOGUS_JOB=true
@@ -30,6 +25,20 @@ matrix:
     - os: linux
       env: TOOLSET=gcc CXXSTD=03,11,1y
 
+    - os: linux
+      env: TOOLSET=gcc-4.4 CXXSTD=98,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.4
+
+    - os: linux
+      env: TOOLSET=gcc-4.6 CXXSTD=03,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.6
+
     - os: linux
       env: TOOLSET=gcc-4.7 CXXSTD=03,11
       addons:
@@ -153,6 +162,17 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-trusty-4.0
 
+    - os: linux
+      env: TOOLSET=clang-5.0 CXXSTD=03,11,14,1z,2a
+      addons:
+        apt:
+          packages:
+            - clang-5.0
+            - libstdc++-4.9-dev
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-5.0
+
     - os: osx
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
 
diff --git a/appveyor.yml b/appveyor.yml
index d75679ef..4613ff61 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,25 +7,35 @@ version: 1.0.{build}-{branch}
 
 shallow_clone: true
 
-branches:
-  only:
-    - master
-    - develop
-
 environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-9.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-10.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-11.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-12.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-14.0
+      CXXSTD: 14
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      TOOLSET: msvc-14.0
+      CXXSTD: latest
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: msvc-14.1
+      CXXSTD: 14
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc-14.1
+      CXXSTD: 17
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc-14.1
+      CXXSTD: latest
 
 install:
   - set BOOST_BRANCH=develop
@@ -72,4 +82,4 @@ install:
 build: off
 
 test_script:
-  - b2 -j%NUMBER_OF_PROCESSORS% --hash libs/fusion/test toolset=%TOOLSET%
+  - b2 -j%NUMBER_OF_PROCESSORS% --hash libs/fusion/test toolset=%TOOLSET% cxxstd=%CXXSTD%
diff --git a/include/boost/fusion/container/deque/detail/keyed_element.hpp b/include/boost/fusion/container/deque/detail/keyed_element.hpp
index 15b68667..3ab88b92 100644
--- a/include/boost/fusion/container/deque/detail/keyed_element.hpp
+++ b/include/boost/fusion/container/deque/detail/keyed_element.hpp
@@ -13,6 +13,11 @@
 #include <boost/fusion/iterator/deref.hpp>
 #include <boost/fusion/iterator/next.hpp>
 
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)
+#include <boost/core/enable_if.hpp>
+#include <boost/type_traits/is_same.hpp>
+#endif
+
 namespace boost { namespace fusion
 {
     struct fusion_sequence_tag;
@@ -114,8 +119,13 @@ namespace boost { namespace fusion { namespace detail
         {}
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)
+        template <typename Value_, typename = typename enable_if<is_same<Value_, Value> >::type>
+#else
+        typedef Value Value_;
+#endif
         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        keyed_element(Value&& value, Rest&& rest)
+        keyed_element(Value_&& value, Rest&& rest)
             : Rest(std::move(rest))
             , value_(BOOST_FUSION_FWD_ELEM(Value, value))
         {}
diff --git a/include/boost/fusion/container/list/cons.hpp b/include/boost/fusion/container/list/cons.hpp
index 0dd91b0c..dd7f8873 100644
--- a/include/boost/fusion/container/list/cons.hpp
+++ b/include/boost/fusion/container/list/cons.hpp
@@ -70,6 +70,10 @@ namespace boost { namespace fusion
         cons(cons<Car2, Cdr2> const& rhs)
             : car(rhs.car), cdr(rhs.cdr) {}
 
+#if BOOST_WORKAROUND(BOOST_GCC, / 100 == 406) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
+        // Workaround for `array used as initializer` compile error on gcc 4.6 w/ c++0x.
+        template <typename = void>
+#endif
         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
         cons(cons const& rhs)
             : car(rhs.car), cdr(rhs.cdr) {}
diff --git a/include/boost/fusion/support/config.hpp b/include/boost/fusion/support/config.hpp
index 65fe2f35..5a0f572e 100644
--- a/include/boost/fusion/support/config.hpp
+++ b/include/boost/fusion/support/config.hpp
@@ -99,7 +99,7 @@ namespace std
 
 // Workaround for compiler which doesn't compile decltype(expr)::type.
 // It expects decltype(expr) deduced as mpl::identity<T>.
-#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1913))
+#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1913)) || BOOST_WORKAROUND(BOOST_GCC, < 40700)
 #   include <boost/mpl/identity.hpp>
 #   define BOOST_FUSION_IDENTIFIED_TYPE(parenthesized_expr) \
         boost::mpl::identity<decltype parenthesized_expr>::type::type
diff --git a/meta/explicit-failures-markup.xml b/meta/explicit-failures-markup.xml
index 27438953..c2e6ea97 100644
--- a/meta/explicit-failures-markup.xml
+++ b/meta/explicit-failures-markup.xml
@@ -9,8 +9,8 @@
             <toolset name="msvc-11.0"/>
             <toolset name="msvc-12.0"/>
             <toolset name="qcc-4.4.2_x86"/>
-            <toolset name="gcc-gnu-4.4~c++0x*"/>
-            <toolset name="gcc-gnu-4.4~gnu0x*"/>
+            <toolset name="gcc-4.4~c++0x*"/>
+            <toolset name="gcc-4.4~gnu0x*"/>
             <note author="Kohei Takahashi">
                 The compiler doesn't generate defaulted move ctor/assgin thus
                 perform copy construction/assginment. Even though such case,
diff --git a/test/sequence/define_struct_inline_move.cpp b/test/sequence/define_struct_inline_move.cpp
index 951f7e4f..3c707404 100644
--- a/test/sequence/define_struct_inline_move.cpp
+++ b/test/sequence/define_struct_inline_move.cpp
@@ -47,8 +47,8 @@ int main()
         BOOST_TEST(y.w.value == 42);
     }
 
-    // Older MSVCs don't generate move ctor by default.
-#if !(defined(CI_SKIP_KNOWN_FAILURE) && BOOST_WORKAROUND(BOOST_MSVC, < 1900))
+    // Older MSVCs and gcc 4.4 don't generate move ctor by default.
+#if !(defined(CI_SKIP_KNOWN_FAILURE) && (BOOST_WORKAROUND(BOOST_MSVC, < 1900) || BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)))
     {
         ns::value x;
         ns::value y(std::move(x)); // move
@@ -66,7 +66,7 @@ int main()
         BOOST_TEST(x.w.value == 0);
         BOOST_TEST(y.w.value == 0);
     }
-#endif // !(ci && msvc < 14.0)
+#endif // !(ci && (msvc < 14.0 || gcc 4.4.x))
 
     return boost::report_errors();
 }
diff --git a/test/sequence/define_tpl_struct_inline_move.cpp b/test/sequence/define_tpl_struct_inline_move.cpp
index b95da6f6..39a00079 100644
--- a/test/sequence/define_tpl_struct_inline_move.cpp
+++ b/test/sequence/define_tpl_struct_inline_move.cpp
@@ -47,8 +47,8 @@ int main()
         BOOST_TEST(y.w.value == 42);
     }
 
-    // Older MSVCs don't generate move ctor by default.
-#if !(defined(CI_SKIP_KNOWN_FAILURE) && BOOST_WORKAROUND(BOOST_MSVC, < 1900))
+    // Older MSVCs and gcc 4.4 don't generate move ctor by default.
+#if !(defined(CI_SKIP_KNOWN_FAILURE) && (BOOST_WORKAROUND(BOOST_MSVC, < 1900) || BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)))
     {
         ns::value<wrapper> x;
         ns::value<wrapper> y(std::move(x)); // move
@@ -66,7 +66,7 @@ int main()
         BOOST_TEST(x.w.value == 0);
         BOOST_TEST(y.w.value == 0);
     }
-#endif // !(ci && msvc < 14.0)
+#endif // !(ci && (msvc < 14.0 || gcc 4.4.x))
 
     return boost::report_errors();
 }
diff --git a/test/sequence/github-176.cpp b/test/sequence/github-176.cpp
index 82960e9a..3301220d 100644
--- a/test/sequence/github-176.cpp
+++ b/test/sequence/github-176.cpp
@@ -81,6 +81,9 @@ int main()
     test_at<list<int[3]> >();
     test_at<tuple<int[3]> >();
 
+#if !BOOST_WORKAROUND(BOOST_GCC, / 100 == 406) || defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
+    // FIXME: gcc 4.6 w/ c++0x doesn't like set with array...
     test_at_key<set<int[3]> >();
+#endif
     test_at_key<map<pair<int[3], int[3]> > >();
 }
diff --git a/test/sequence/hash.hpp b/test/sequence/hash.hpp
index 7dea0a3f..b298f418 100644
--- a/test/sequence/hash.hpp
+++ b/test/sequence/hash.hpp
@@ -1,5 +1,6 @@
 /*=============================================================================
     Copyright (c) 2014 Christoph Weiss
+    Copyright (c) 2017 Kohei Takahashi
 
     Distributed under the Boost Software License, Version 1.0. (See accompanying 
     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -11,24 +12,24 @@
 #include <boost/fusion/sequence/hash.hpp>
 #include <boost/functional/hash.hpp>
 
-void
-hash_test()
+void hash_test()
 {
-    using namespace boost::fusion;
+    namespace fusion = boost::fusion;
+    using namespace fusion;
 
     const FUSION_SEQUENCE<int, char, bool, std::string> v0(42, 'x', false, "Aurea prima");
     const FUSION_SEQUENCE<int, char, bool, std::string> v1(42, 'x', false, "Aurea prima");
-    BOOST_TEST(hash_value(v0) == hash_value(v1));
-    
+    BOOST_TEST(fusion::hash_value(v0) == fusion::hash_value(v1));
+
     const FUSION_SEQUENCE<int, char, bool, std::string> w(41, 'x', false, "Aurea prima");
-    BOOST_TEST(hash_value(w) != hash_value(v0));
-    
+    BOOST_TEST(fusion::hash_value(w) != fusion::hash_value(v0));
+
     const FUSION_SEQUENCE<int, char, bool, std::string> x(42, 'y', false, "Aurea prima");
-    BOOST_TEST(hash_value(x) != hash_value(v0));
-    
+    BOOST_TEST(fusion::hash_value(x) != fusion::hash_value(v0));
+
     const FUSION_SEQUENCE<int, char, bool, std::string> y(42, 'x', true, "Aurea prima");
-    BOOST_TEST(hash_value(y) != hash_value(v0));
-    
+    BOOST_TEST(fusion::hash_value(y) != fusion::hash_value(v0));
+
     const FUSION_SEQUENCE<int, char, bool, std::string> z(42, 'x', false, "quae vindice nullo");
-    BOOST_TEST(hash_value(z) != hash_value(v0));
+    BOOST_TEST(fusion::hash_value(z) != fusion::hash_value(v0));
 }
diff --git a/test/sequence/traits.hpp b/test/sequence/traits.hpp
index b409936e..3684604e 100644
--- a/test/sequence/traits.hpp
+++ b/test/sequence/traits.hpp
@@ -1,5 +1,6 @@
 /*=============================================================================
     Copyright (C) 2016 Lee Clagett
+    Copyright (C) 2018 Kohei Takahashi
 
     Distributed under the Boost Software License, Version 1.0. (See accompanying
     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -38,9 +39,7 @@ bool is_convertible(bool has_conversion)
 }
 
 // is_constructible has a few requirements
-#if !defined(BOOST_NO_CXX11_DECLTYPE) &&   \
-    !defined(BOOST_NO_CXX11_TEMPLATES) &&  \
-    !defined(BOOST_NO_SFINAE_EXPR)
+#ifdef BOOST_TT_IS_CONSTRUCTIBLE_CONFORMING
 
 #define FUSION_TEST_HAS_CONSTRUCTIBLE
 
@@ -88,7 +87,9 @@ void test_constructible()
     BOOST_TEST((
         is_constructible<FUSION_SEQUENCE<convertible>, convertible>(true)
     ));
-        
+
+    // boost::is_constructible always fail to test ctor which takes 2 or more arguments on GCC 4.7.
+#if !BOOST_WORKAROUND(BOOST_GCC, < 40700)
     BOOST_TEST((
         is_constructible<FUSION_SEQUENCE<int, int>, int, int>(true)
     ));
@@ -131,6 +132,7 @@ void test_constructible()
             FUSION_SEQUENCE<convertible, convertible>, convertible, convertible
         >(true)
     ));
+#endif // !(gcc < 4.7)
 }
 
 #endif // is_constructible is available
diff --git a/test/sequence/tuple_traits.cpp b/test/sequence/tuple_traits.cpp
index 6d18c231..f065504a 100644
--- a/test/sequence/tuple_traits.cpp
+++ b/test/sequence/tuple_traits.cpp
@@ -65,10 +65,13 @@ main()
     BOOST_TEST((is_constructible<tuple<int>, int, int>(false)));
 
     BOOST_TEST((is_constructible< tuple<int, int> >(true)));
+    // boost::is_constructible always fail to test ctor which takes 2 or more arguments on GCC 4.7.
+#if !BOOST_WORKAROUND(BOOST_GCC, < 40700)
     BOOST_TEST((is_constructible<tuple<int, int>, int, int>(true)));
     BOOST_TEST((
         is_constructible<tuple<convertible, convertible>, int, int>(true)
     ));
+#endif // !(gcc < 4.7)
     BOOST_TEST((is_constructible<tuple<int, not_convertible>, int, int>(false)));
     BOOST_TEST((is_constructible<tuple<not_convertible, int>, int, int>(false)));
     BOOST_TEST((