diff --git a/cmake/HPX_AddConfigTest.cmake b/cmake/HPX_AddConfigTest.cmake
index 881fe51b1610..d3adb881c377 100644
--- a/cmake/HPX_AddConfigTest.cmake
+++ b/cmake/HPX_AddConfigTest.cmake
@@ -4,7 +4,7 @@
 # Copyright (c) 2017 Google
 # Copyright (c) 2017 Taeguk Kwon
 # Copyright (c) 2020 Giannis Gonidelis
-# Copyright (c) 2021-2022 Hartmut Kaiser
+# Copyright (c) 2021-2024 Hartmut Kaiser
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -373,7 +373,7 @@ endfunction()
 function(hpx_check_for_cxx14_delete_operator_with_size)
   add_hpx_config_test(
     HPX_WITH_CXX14_DELETE_OPERATOR_WITH_SIZE
-    SOURCE cmake/tests/cxx_14_delete_operator_with_size.cpp
+    SOURCE cmake/tests/cxx14_delete_operator_with_size.cpp
     FILE ${ARGN}
   )
 endfunction()
@@ -669,51 +669,6 @@ function(hpx_check_for_cxx_lambda_capture_decltype)
   )
 endfunction()
 
-# ##############################################################################
-function(hpx_check_for_builtin_integer_pack)
-  add_hpx_config_test(
-    HPX_WITH_BUILTIN_INTEGER_PACK
-    SOURCE cmake/tests/builtin_integer_pack.cpp
-    FILE ${ARGN}
-  )
-endfunction()
-
-# ##############################################################################
-function(hpx_check_for_builtin_make_integer_seq)
-  add_hpx_config_test(
-    HPX_WITH_BUILTIN_MAKE_INTEGER_SEQ
-    SOURCE cmake/tests/builtin_make_integer_seq.cpp
-    FILE ${ARGN}
-  )
-endfunction()
-
-# ##############################################################################
-function(hpx_check_for_builtin_make_integer_seq_cuda)
-  add_hpx_config_test(
-    HPX_WITH_BUILTIN_MAKE_INTEGER_SEQ_CUDA
-    SOURCE cmake/tests/builtin_make_integer_seq.cu CUDA
-    FILE ${ARGN}
-  )
-endfunction()
-
-# ##############################################################################
-function(hpx_check_for_builtin_type_pack_element)
-  add_hpx_config_test(
-    HPX_WITH_BUILTIN_TYPE_PACK_ELEMENT
-    SOURCE cmake/tests/builtin_type_pack_element.cpp
-    FILE ${ARGN}
-  )
-endfunction()
-
-# ##############################################################################
-function(hpx_check_for_builtin_type_pack_element_cuda)
-  add_hpx_config_test(
-    HPX_WITH_BUILTIN_TYPE_PACK_ELEMENT_CUDA
-    SOURCE cmake/tests/builtin_type_pack_element.cu CUDA
-    FILE ${ARGN}
-  )
-endfunction()
-
 # ##############################################################################
 function(hpx_check_for_mm_prefetch)
   add_hpx_config_test(
diff --git a/cmake/HPX_PerformCxxFeatureTests.cmake b/cmake/HPX_PerformCxxFeatureTests.cmake
index ea43a3bb1a76..2e9d02eb8de6 100644
--- a/cmake/HPX_PerformCxxFeatureTests.cmake
+++ b/cmake/HPX_PerformCxxFeatureTests.cmake
@@ -169,29 +169,6 @@ function(hpx_perform_cxx_feature_tests)
     DEFINITIONS HPX_HAVE_CXX_LAMBDA_CAPTURE_DECLTYPE
   )
 
-  # Check the availability of certain C++ builtins
-  hpx_check_for_builtin_integer_pack(DEFINITIONS HPX_HAVE_BUILTIN_INTEGER_PACK)
-
-  hpx_check_for_builtin_make_integer_seq(
-    DEFINITIONS HPX_HAVE_BUILTIN_MAKE_INTEGER_SEQ
-  )
-
-  if(HPX_WITH_CUDA)
-    hpx_check_for_builtin_make_integer_seq_cuda(
-      DEFINITIONS HPX_HAVE_BUILTIN_MAKE_INTEGER_SEQ_CUDA
-    )
-  endif()
-
-  hpx_check_for_builtin_type_pack_element(
-    DEFINITIONS HPX_HAVE_BUILTIN_TYPE_PACK_ELEMENT
-  )
-
-  if(HPX_WITH_CUDA)
-    hpx_check_for_builtin_type_pack_element_cuda(
-      DEFINITIONS HPX_HAVE_BUILTIN_TYPE_PACK_ELEMENT_CUDA
-    )
-  endif()
-
   hpx_check_for_builtin_forward_move(DEFINITIONS HPX_HAVE_BUILTIN_FORWARD_MOVE)
 
 endfunction()
diff --git a/cmake/tests/builtin_integer_pack.cpp b/cmake/tests/builtin_integer_pack.cpp
deleted file mode 100644
index ced395b75e56..000000000000
--- a/cmake/tests/builtin_integer_pack.cpp
+++ /dev/null
@@ -1,31 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-//  Copyright (c) 2020 Agustin Berge
-//
-//  SPDX-License-Identifier: BSL-1.0
-//  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)
-////////////////////////////////////////////////////////////////////////////////
-
-#include <cstddef>
-#include <type_traits>
-
-template <typename T, T... Vs>
-struct pack_c
-{
-};
-
-template <typename = void>
-void test()
-{
-    static_assert(std::is_same_v<pack_c<std::size_t, __integer_pack(0)...>,
-        pack_c<std::size_t>>);
-    static_assert(std::is_same_v<pack_c<std::size_t, __integer_pack(1)...>,
-        pack_c<std::size_t, 0>>);
-    static_assert(std::is_same_v<pack_c<std::size_t, __integer_pack(2)...>,
-        pack_c<std::size_t, 0, 1>>);
-}
-
-int main()
-{
-    test();
-}
diff --git a/cmake/tests/builtin_make_integer_seq.cpp b/cmake/tests/builtin_make_integer_seq.cpp
deleted file mode 100644
index d9e602cf900c..000000000000
--- a/cmake/tests/builtin_make_integer_seq.cpp
+++ /dev/null
@@ -1,31 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-//  Copyright (c) 2020 Agustin Berge
-//
-//  SPDX-License-Identifier: BSL-1.0
-//  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)
-////////////////////////////////////////////////////////////////////////////////
-
-#include <cstddef>
-#include <type_traits>
-
-template <typename T, T... Vs>
-struct pack_c
-{
-};
-
-template <typename = void>
-void test()
-{
-    static_assert(std::is_same_v<__make_integer_seq<pack_c, std::size_t, 0>,
-        pack_c<std::size_t>>);
-    static_assert(std::is_same_v<__make_integer_seq<pack_c, std::size_t, 1>,
-        pack_c<std::size_t, 0>>);
-    static_assert(std::is_same_v<__make_integer_seq<pack_c, std::size_t, 2>,
-        pack_c<std::size_t, 0, 1>>);
-}
-
-int main()
-{
-    test();
-}
diff --git a/cmake/tests/builtin_make_integer_seq.cu b/cmake/tests/builtin_make_integer_seq.cu
deleted file mode 100644
index de0ba3748244..000000000000
--- a/cmake/tests/builtin_make_integer_seq.cu
+++ /dev/null
@@ -1,9 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-//  Copyright (c) 2020 Agustin Berge
-//
-//  SPDX-License-Identifier: BSL-1.0
-//  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)
-////////////////////////////////////////////////////////////////////////////////
-
-#include "builtin_make_integer_seq.cpp"
diff --git a/cmake/tests/builtin_type_pack_element.cpp b/cmake/tests/builtin_type_pack_element.cpp
deleted file mode 100644
index 3965459051bb..000000000000
--- a/cmake/tests/builtin_type_pack_element.cpp
+++ /dev/null
@@ -1,26 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-//  Copyright (c) 2020 Agustin Berge
-//
-//  SPDX-License-Identifier: BSL-1.0
-//  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)
-////////////////////////////////////////////////////////////////////////////////
-
-#include <tuple>
-#include <type_traits>
-
-template <typename... Ts>
-void test()
-{
-    static_assert(std::is_same_v<__type_pack_element<0, Ts...>,
-        typename std::tuple_element<0, std::tuple<Ts...>>::type>);
-    static_assert(std::is_same_v<__type_pack_element<1, Ts...>,
-        typename std::tuple_element<1, std::tuple<Ts...>>::type>);
-    static_assert(std::is_same_v<__type_pack_element<2, Ts...>,
-        typename std::tuple_element<2, std::tuple<Ts...>>::type>);
-}
-
-int main()
-{
-    test<int, float, double>();
-}
diff --git a/cmake/tests/builtin_type_pack_element.cu b/cmake/tests/builtin_type_pack_element.cu
deleted file mode 100644
index 067f276e6531..000000000000
--- a/cmake/tests/builtin_type_pack_element.cu
+++ /dev/null
@@ -1,9 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-//  Copyright (c) 2020 Agustin Berge
-//
-//  SPDX-License-Identifier: BSL-1.0
-//  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)
-////////////////////////////////////////////////////////////////////////////////
-
-#include "builtin_type_pack_element.cpp"
diff --git a/cmake/tests/cxx_14_delete_operator_with_size.cpp b/cmake/tests/cxx14_delete_operator_with_size.cpp
similarity index 100%
rename from cmake/tests/cxx_14_delete_operator_with_size.cpp
rename to cmake/tests/cxx14_delete_operator_with_size.cpp
diff --git a/libs/core/type_support/include/hpx/type_support/pack.hpp b/libs/core/type_support/include/hpx/type_support/pack.hpp
index 47442f02c10d..93c5657d0dc1 100644
--- a/libs/core/type_support/include/hpx/type_support/pack.hpp
+++ b/libs/core/type_support/include/hpx/type_support/pack.hpp
@@ -1,4 +1,5 @@
 //  Copyright (c) 2014-2020 Agustin Berge
+//  Copyright (c) 2024 Hartmut Kaiser
 //
 //  SPDX-License-Identifier: BSL-1.0
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -45,17 +46,8 @@ namespace hpx::util {
 
     template <std::size_t N>
     struct make_index_pack
-#if defined(HPX_HAVE_BUILTIN_INTEGER_PACK)
-      : index_pack<__integer_pack(N)...>
-#elif (defined(HPX_HAVE_BUILTIN_MAKE_INTEGER_SEQ) &&                           \
-    !defined(HPX_COMPUTE_DEVICE_CODE)) ||                                      \
-    (defined(HPX_HAVE_BUILTIN_MAKE_INTEGER_SEQ_CUDA) &&                        \
-        defined(HPX_COMPUTE_DEVICE_CODE))
-      : __make_integer_seq<pack_c, std::size_t, N>
-#else
       : detail::make_index_pack_join<typename make_index_pack<N / 2>::type,
             typename make_index_pack<N - N / 2>::type>
-#endif
     {
     };
 
@@ -168,21 +160,6 @@ namespace hpx::util {
         {
         };
 
-#if (defined(HPX_HAVE_BUILTIN_TYPE_PACK_ELEMENT) &&                            \
-    !defined(HPX_COMPUTE_DEVICE_CODE)) ||                                      \
-    (defined(HPX_HAVE_BUILTIN_TYPE_PACK_ELEMENT_CUDA) &&                       \
-        defined(HPX_COMPUTE_DEVICE_CODE))
-        template <std::size_t I, typename Ts, bool InBounds = (I < Ts::size)>
-        struct at_index_impl : empty_helper
-        {
-        };
-
-        template <std::size_t I, typename... Ts>
-        struct at_index_impl<I, pack<Ts...>, /*InBounds*/ true>
-        {
-            using type = __type_pack_element<I, Ts...>;
-        };
-#else
         template <std::size_t I, typename T>
         struct indexed
         {
@@ -210,7 +187,6 @@ namespace hpx::util {
                 indexer<Ts, make_index_pack_t<Ts::size>>()))
         {
         };
-#endif
     }    // namespace detail
 
     template <std::size_t I, typename... Ts>