diff --git a/docs/source/build.rst b/docs/source/build.rst
deleted file mode 100644
index e69de29bb..000000000
diff --git a/include/xsimd/arch/common/xsimd_common_details.hpp b/include/xsimd/arch/common/xsimd_common_details.hpp
index a99f19319..fc131b909 100644
--- a/include/xsimd/arch/common/xsimd_common_details.hpp
+++ b/include/xsimd/arch/common/xsimd_common_details.hpp
@@ -301,13 +301,11 @@ namespace xsimd
                 using type = with_slow_conversion;
             };
 
-            using xsimd::detail::void_t;
-
             template <class A, class From, class To>
             struct conversion_type_impl<A, From, To,
-                                        void_t<decltype(fast_cast(std::declval<const batch<From, A>&>(),
-                                                                  std::declval<const batch<To, A>&>(),
-                                                                  std::declval<const A&>()))>>
+                                        std::void_t<decltype(fast_cast(std::declval<const batch<From, A>&>(),
+                                                                       std::declval<const batch<To, A>&>(),
+                                                                       std::declval<const A&>()))>>
             {
                 using type = with_fast_conversion;
             };
diff --git a/include/xsimd/memory/xsimd_alignment.hpp b/include/xsimd/memory/xsimd_alignment.hpp
index 30c2d16de..92f8edd87 100644
--- a/include/xsimd/memory/xsimd_alignment.hpp
+++ b/include/xsimd/memory/xsimd_alignment.hpp
@@ -74,7 +74,7 @@ namespace xsimd
     };
 
     template <class C>
-    struct container_alignment<C, detail::void_t<typename C::allocator_type>>
+    struct container_alignment<C, std::void_t<typename C::allocator_type>>
     {
         using type = allocator_alignment_t<typename C::allocator_type>;
     };
diff --git a/include/xsimd/types/xsimd_api.hpp b/include/xsimd/types/xsimd_api.hpp
index b1ec3e58f..19e81784d 100644
--- a/include/xsimd/types/xsimd_api.hpp
+++ b/include/xsimd/types/xsimd_api.hpp
@@ -371,7 +371,7 @@ namespace xsimd
         template <class Arch, class Batch, class BatchConstant>
         struct has_bitwise_lshift_batch_const<
             Arch, Batch, BatchConstant,
-            void_t<decltype(kernel::bitwise_lshift<Arch>(
+            std::void_t<decltype(kernel::bitwise_lshift<Arch>(
                 std::declval<Batch>(), std::declval<BatchConstant>(), Arch {}))>>
             : std::true_type
         {
diff --git a/include/xsimd/types/xsimd_utils.hpp b/include/xsimd/types/xsimd_utils.hpp
index 5dbab8551..847d889d5 100644
--- a/include/xsimd/types/xsimd_utils.hpp
+++ b/include/xsimd/types/xsimd_utils.hpp
@@ -190,9 +190,8 @@ namespace xsimd
     inline To bit_cast(From val) noexcept
     {
         static_assert(sizeof(From) == sizeof(To), "casting between compatible layout");
-        // FIXME: Some old version of GCC don't support that trait
-        // static_assert(std::is_trivially_copyable<From>::value, "input type is trivially copyable");
-        // static_assert(std::is_trivially_copyable<To>::value, "output type is trivially copyable");
+        static_assert(std::is_trivially_copyable<From>::value, "input type is trivially copyable");
+        static_assert(std::is_trivially_copyable<To>::value, "output type is trivially copyable");
         To res;
         std::memcpy(&res, &val, sizeof(val));
         return res;
@@ -255,19 +254,13 @@ namespace xsimd
         } // namespace detail
     } // namespace kernel
 
-    /*****************************************
-     * Backport of index_sequence from c++14 *
-     *****************************************/
+    /********************************************
+     * int_sequence and make_sequence_as_bactch *
+     ********************************************/
 
     // TODO: Remove this once we drop C++11 support
     namespace detail
     {
-        template <typename T>
-        struct identity
-        {
-            using type = T;
-        };
-
         template <int... Is>
         using int_sequence = std::integer_sequence<int, Is...>;
 
@@ -291,38 +284,6 @@ namespace xsimd
         }
     }
 
-    /*********************************
-     * Backport of void_t from C++17 *
-     *********************************/
-
-    namespace detail
-    {
-        template <class... T>
-        struct make_void
-        {
-            using type = void;
-        };
-
-        template <class... T>
-        using void_t = typename make_void<T...>::type;
-    }
-
-    /**************************************************
-     * Equivalent of void_t but with size_t parameter *
-     **************************************************/
-
-    namespace detail
-    {
-        template <std::size_t>
-        struct check_size
-        {
-            using type = void;
-        };
-
-        template <std::size_t S>
-        using check_size_t = typename check_size<S>::type;
-    }
-
     /*****************************************
      * Supplementary std::array constructors *
      *****************************************/