diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -533,7 +533,6 @@
   __pstl/internal/parallel_backend_tbb.h
   __pstl/internal/parallel_backend_utils.h
   __pstl/internal/parallel_impl.h
-  __pstl/internal/pstl_config.h
   __pstl/internal/unseq_backend_simd.h
   __pstl/internal/utils.h
   __pstl_algorithm
diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -1271,6 +1271,46 @@
 #    define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS
 #  endif
 
+// TODO: Make this a proper configuration option
+#define _PSTL_PAR_BACKEND_SERIAL
+
+#define _PSTL_PRAGMA(x) _Pragma(#    x)
+
+// Enable SIMD for compilers that support OpenMP 4.0
+#if (defined(_OPENMP) && _OPENMP >= 201307)
+
+#  define _PSTL_UDR_PRESENT
+#  define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
+#  define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
+#  define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
+#  define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))
+#  define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))
+#  define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))
+
+// Declaration of reduction functor, where
+// NAME - the name of the functor
+// OP - type of the callable object with the reduction operation
+// omp_in - refers to the local partial result
+// omp_out - refers to the final value of the combiner operator
+// omp_priv - refers to the private copy of the initial value
+// omp_orig - refers to the original variable to be reduced
+#  define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)                                                                     \
+    _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))
+
+#else // (defined(_OPENMP) && _OPENMP >= 201307)
+
+#  define _PSTL_PRAGMA_SIMD
+#  define _PSTL_PRAGMA_DECLARE_SIMD
+#  define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)
+#  define _PSTL_PRAGMA_SIMD_SCAN(PRM)
+#  define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
+#  define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
+#  define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)
+
+#endif // (defined(_OPENMP) && _OPENMP >= 201307)
+
+#define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED
+
 #endif // __cplusplus
 
 #endif // _LIBCPP___CONFIG
diff --git a/libcxx/include/__pstl/internal/algorithm_fwd.h b/libcxx/include/__pstl/internal/algorithm_fwd.h
--- a/libcxx/include/__pstl/internal/algorithm_fwd.h
+++ b/libcxx/include/__pstl/internal/algorithm_fwd.h
@@ -10,12 +10,11 @@
 #ifndef _PSTL_ALGORITHM_FWD_H
 #define _PSTL_ALGORITHM_FWD_H
 
+#include <__config>
 #include <iterator>
 #include <type_traits>
 #include <utility>
 
-#include "pstl_config.h"
-
 namespace __pstl {
 namespace __internal {
 
diff --git a/libcxx/include/__pstl/internal/algorithm_impl.h b/libcxx/include/__pstl/internal/algorithm_impl.h
--- a/libcxx/include/__pstl/internal/algorithm_impl.h
+++ b/libcxx/include/__pstl/internal/algorithm_impl.h
@@ -11,6 +11,7 @@
 #define _PSTL_ALGORITHM_IMPL_H
 
 #include <__assert>
+#include <__config>
 #include <algorithm>
 #include <functional>
 #include <iterator>
@@ -22,7 +23,6 @@
 #include "parallel_backend.h"
 #include "parallel_backend_utils.h"
 #include "parallel_impl.h"
-#include "pstl_config.h"
 #include "unseq_backend_simd.h"
 
 namespace __pstl {
diff --git a/libcxx/include/__pstl/internal/execution_defs.h b/libcxx/include/__pstl/internal/execution_defs.h
--- a/libcxx/include/__pstl/internal/execution_defs.h
+++ b/libcxx/include/__pstl/internal/execution_defs.h
@@ -10,12 +10,11 @@
 #ifndef _PSTL_EXECUTION_POLICY_DEFS_H
 #define _PSTL_EXECUTION_POLICY_DEFS_H
 
+#include <__config>
 #include <__type_traits/decay.h>
 #include <__type_traits/enable_if.h>
 #include <__type_traits/integral_constant.h>
 
-#include "pstl_config.h"
-
 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
 
 namespace __pstl {
diff --git a/libcxx/include/__pstl/internal/execution_impl.h b/libcxx/include/__pstl/internal/execution_impl.h
--- a/libcxx/include/__pstl/internal/execution_impl.h
+++ b/libcxx/include/__pstl/internal/execution_impl.h
@@ -10,13 +10,13 @@
 #ifndef _PSTL_EXECUTION_IMPL_H
 #define _PSTL_EXECUTION_IMPL_H
 
+#include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__type_traits/conditional.h>
 #include <__type_traits/conjunction.h>
 #include <__type_traits/is_base_of.h>
 
 #include "execution_defs.h"
-#include "pstl_config.h"
 
 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
 
diff --git a/libcxx/include/__pstl/internal/glue_algorithm_defs.h b/libcxx/include/__pstl/internal/glue_algorithm_defs.h
--- a/libcxx/include/__pstl/internal/glue_algorithm_defs.h
+++ b/libcxx/include/__pstl/internal/glue_algorithm_defs.h
@@ -10,11 +10,11 @@
 #ifndef _PSTL_GLUE_ALGORITHM_DEFS_H
 #define _PSTL_GLUE_ALGORITHM_DEFS_H
 
+#include <__config>
 #include <functional>
 #include <iterator>
 
 #include "execution_defs.h"
-#include "pstl_config.h"
 
 namespace std {
 
diff --git a/libcxx/include/__pstl/internal/glue_algorithm_impl.h b/libcxx/include/__pstl/internal/glue_algorithm_impl.h
--- a/libcxx/include/__pstl/internal/glue_algorithm_impl.h
+++ b/libcxx/include/__pstl/internal/glue_algorithm_impl.h
@@ -10,10 +10,9 @@
 #ifndef _PSTL_GLUE_ALGORITHM_IMPL_H
 #define _PSTL_GLUE_ALGORITHM_IMPL_H
 
+#include <__config>
 #include <functional>
 
-#include "pstl_config.h"
-
 #include "algorithm_fwd.h"
 #include "execution_defs.h"
 #include "numeric_fwd.h" /* count and count_if use __pattern_transform_reduce */
diff --git a/libcxx/include/__pstl/internal/glue_memory_defs.h b/libcxx/include/__pstl/internal/glue_memory_defs.h
--- a/libcxx/include/__pstl/internal/glue_memory_defs.h
+++ b/libcxx/include/__pstl/internal/glue_memory_defs.h
@@ -10,8 +10,9 @@
 #ifndef _PSTL_GLUE_MEMORY_DEFS_H
 #define _PSTL_GLUE_MEMORY_DEFS_H
 
+#include <__config>
+
 #include "execution_defs.h"
-#include "pstl_config.h"
 
 namespace std {
 
diff --git a/libcxx/include/__pstl/internal/glue_memory_impl.h b/libcxx/include/__pstl/internal/glue_memory_impl.h
--- a/libcxx/include/__pstl/internal/glue_memory_impl.h
+++ b/libcxx/include/__pstl/internal/glue_memory_impl.h
@@ -10,7 +10,7 @@
 #ifndef _PSTL_GLUE_MEMORY_IMPL_H
 #define _PSTL_GLUE_MEMORY_IMPL_H
 
-#include "pstl_config.h"
+#include <__config>
 
 #include "algorithm_fwd.h"
 #include "execution_defs.h"
diff --git a/libcxx/include/__pstl/internal/glue_numeric_defs.h b/libcxx/include/__pstl/internal/glue_numeric_defs.h
--- a/libcxx/include/__pstl/internal/glue_numeric_defs.h
+++ b/libcxx/include/__pstl/internal/glue_numeric_defs.h
@@ -10,10 +10,10 @@
 #ifndef _PSTL_GLUE_NUMERIC_DEFS_H
 #define _PSTL_GLUE_NUMERIC_DEFS_H
 
+#include <__config>
 #include <iterator>
 
 #include "execution_defs.h"
-#include "pstl_config.h"
 
 namespace std {
 // [reduce]
diff --git a/libcxx/include/__pstl/internal/glue_numeric_impl.h b/libcxx/include/__pstl/internal/glue_numeric_impl.h
--- a/libcxx/include/__pstl/internal/glue_numeric_impl.h
+++ b/libcxx/include/__pstl/internal/glue_numeric_impl.h
@@ -10,10 +10,9 @@
 #ifndef _PSTL_GLUE_NUMERIC_IMPL_H
 #define _PSTL_GLUE_NUMERIC_IMPL_H
 
+#include <__config>
 #include <functional>
 
-#include "pstl_config.h"
-
 #include "execution_impl.h"
 #include "numeric_fwd.h"
 #include "utils.h"
diff --git a/libcxx/include/__pstl/internal/memory_impl.h b/libcxx/include/__pstl/internal/memory_impl.h
--- a/libcxx/include/__pstl/internal/memory_impl.h
+++ b/libcxx/include/__pstl/internal/memory_impl.h
@@ -10,9 +10,9 @@
 #ifndef _PSTL_MEMORY_IMPL_H
 #define _PSTL_MEMORY_IMPL_H
 
+#include <__config>
 #include <iterator>
 
-#include "pstl_config.h"
 #include "unseq_backend_simd.h"
 
 namespace __pstl {
diff --git a/libcxx/include/__pstl/internal/numeric_fwd.h b/libcxx/include/__pstl/internal/numeric_fwd.h
--- a/libcxx/include/__pstl/internal/numeric_fwd.h
+++ b/libcxx/include/__pstl/internal/numeric_fwd.h
@@ -10,11 +10,10 @@
 #ifndef _PSTL_NUMERIC_FWD_H
 #define _PSTL_NUMERIC_FWD_H
 
+#include <__config>
 #include <type_traits>
 #include <utility>
 
-#include "pstl_config.h"
-
 namespace __pstl {
 namespace __internal {
 
diff --git a/libcxx/include/__pstl/internal/numeric_impl.h b/libcxx/include/__pstl/internal/numeric_impl.h
--- a/libcxx/include/__pstl/internal/numeric_impl.h
+++ b/libcxx/include/__pstl/internal/numeric_impl.h
@@ -11,12 +11,12 @@
 #define _PSTL_NUMERIC_IMPL_H
 
 #include <__assert>
+#include <__config>
 #include <iterator>
 #include <type_traits>
 #include <numeric>
 
 #include "parallel_backend.h"
-#include "pstl_config.h"
 #include "execution_impl.h"
 #include "unseq_backend_simd.h"
 #include "algorithm_fwd.h"
diff --git a/libcxx/include/__pstl/internal/parallel_backend.h b/libcxx/include/__pstl/internal/parallel_backend.h
--- a/libcxx/include/__pstl/internal/parallel_backend.h
+++ b/libcxx/include/__pstl/internal/parallel_backend.h
@@ -10,7 +10,7 @@
 #ifndef _PSTL_PARALLEL_BACKEND_H
 #define _PSTL_PARALLEL_BACKEND_H
 
-#include "pstl_config.h"
+#include <__config>
 
 #if defined(_PSTL_PAR_BACKEND_SERIAL)
 #    include "parallel_backend_serial.h"
diff --git a/libcxx/include/__pstl/internal/parallel_backend_serial.h b/libcxx/include/__pstl/internal/parallel_backend_serial.h
--- a/libcxx/include/__pstl/internal/parallel_backend_serial.h
+++ b/libcxx/include/__pstl/internal/parallel_backend_serial.h
@@ -10,12 +10,11 @@
 #ifndef _PSTL_PARALLEL_BACKEND_SERIAL_H
 #define _PSTL_PARALLEL_BACKEND_SERIAL_H
 
+#include <__config>
 #include <__memory/allocator.h>
 #include <__pstl/internal/execution_impl.h>
 #include <__utility/forward.h>
 
-#include "pstl_config.h"
-
 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
 
 namespace __pstl
diff --git a/libcxx/include/__pstl/internal/parallel_backend_tbb.h b/libcxx/include/__pstl/internal/parallel_backend_tbb.h
--- a/libcxx/include/__pstl/internal/parallel_backend_tbb.h
+++ b/libcxx/include/__pstl/internal/parallel_backend_tbb.h
@@ -11,10 +11,10 @@
 #define _PSTL_PARALLEL_BACKEND_TBB_H
 
 #include <__assert>
+#include <__config>
 #include <algorithm>
 #include <type_traits>
 
-#include "pstl_config.h"
 #include "parallel_backend_utils.h"
 
 // Bring in minimal required subset of Intel TBB
diff --git a/libcxx/include/__pstl/internal/parallel_backend_utils.h b/libcxx/include/__pstl/internal/parallel_backend_utils.h
--- a/libcxx/include/__pstl/internal/parallel_backend_utils.h
+++ b/libcxx/include/__pstl/internal/parallel_backend_utils.h
@@ -11,13 +11,12 @@
 #define _PSTL_PARALLEL_BACKEND_UTILS_H
 
 #include <__assert>
+#include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__memory/addressof.h>
 
 #include "utils.h"
 
-#include "pstl_config.h"
-
 namespace __pstl
 {
 
diff --git a/libcxx/include/__pstl/internal/parallel_impl.h b/libcxx/include/__pstl/internal/parallel_impl.h
--- a/libcxx/include/__pstl/internal/parallel_impl.h
+++ b/libcxx/include/__pstl/internal/parallel_impl.h
@@ -10,10 +10,9 @@
 #ifndef _PSTL_PARALLEL_IMPL_H
 #define _PSTL_PARALLEL_IMPL_H
 
-#include "pstl_config.h"
-
 #include <__atomic/atomic.h>
 #include <__atomic/memory_order.h>
+#include <__config>
 #include <__pstl/internal/parallel_backend.h>
 
 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
diff --git a/libcxx/include/__pstl/internal/pstl_config.h b/libcxx/include/__pstl/internal/pstl_config.h
deleted file mode 100644
--- a/libcxx/include/__pstl/internal/pstl_config.h
+++ /dev/null
@@ -1,55 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _PSTL_CONFIG_H
-#define _PSTL_CONFIG_H
-
-#include <__config>
-
-// TODO: Make this a proper configuration option
-#define _PSTL_PAR_BACKEND_SERIAL
-
-#define _PSTL_PRAGMA(x) _Pragma(#    x)
-
-// Enable SIMD for compilers that support OpenMP 4.0
-#if (defined(_OPENMP) && _OPENMP >= 201307)
-
-#  define _PSTL_UDR_PRESENT
-#  define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
-#  define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
-#  define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
-#  define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))
-#  define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))
-#  define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))
-
-// Declaration of reduction functor, where
-// NAME - the name of the functor
-// OP - type of the callable object with the reduction operation
-// omp_in - refers to the local partial result
-// omp_out - refers to the final value of the combiner operator
-// omp_priv - refers to the private copy of the initial value
-// omp_orig - refers to the original variable to be reduced
-#  define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)                                                                     \
-    _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))
-
-#else // (defined(_OPENMP) && _OPENMP >= 201307)
-
-#  define _PSTL_PRAGMA_SIMD
-#  define _PSTL_PRAGMA_DECLARE_SIMD
-#  define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)
-#  define _PSTL_PRAGMA_SIMD_SCAN(PRM)
-#  define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
-#  define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
-#  define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)
-
-#endif // (defined(_OPENMP) && _OPENMP >= 201307)
-
-#define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED
-
-#endif /* _PSTL_CONFIG_H */
diff --git a/libcxx/include/__pstl/internal/unseq_backend_simd.h b/libcxx/include/__pstl/internal/unseq_backend_simd.h
--- a/libcxx/include/__pstl/internal/unseq_backend_simd.h
+++ b/libcxx/include/__pstl/internal/unseq_backend_simd.h
@@ -10,13 +10,13 @@
 #ifndef _PSTL_UNSEQ_BACKEND_SIMD_H
 #define _PSTL_UNSEQ_BACKEND_SIMD_H
 
+#include <__config>
 #include <__functional/operations.h>
 #include <__type_traits/is_arithmetic.h>
 #include <__utility/pair.h>
 #include <cstddef>
 #include <cstdint>
 
-#include "pstl_config.h"
 #include "utils.h"
 
 // This header defines the minimum set of vector routines required
diff --git a/libcxx/include/__pstl/internal/utils.h b/libcxx/include/__pstl/internal/utils.h
--- a/libcxx/include/__pstl/internal/utils.h
+++ b/libcxx/include/__pstl/internal/utils.h
@@ -10,8 +10,8 @@
 #ifndef _PSTL_UTILS_H
 #define _PSTL_UTILS_H
 
+#include <__config>
 #include <__exception/terminate.h>
-#include <__pstl/internal/pstl_config.h>
 #include <__utility/forward.h>
 #include <new>
 
diff --git a/libcxx/utils/data/ignore_format.txt b/libcxx/utils/data/ignore_format.txt
--- a/libcxx/utils/data/ignore_format.txt
+++ b/libcxx/utils/data/ignore_format.txt
@@ -523,7 +523,6 @@
 libcxx/include/__pstl/internal/parallel_backend_tbb.h
 libcxx/include/__pstl/internal/parallel_backend_utils.h
 libcxx/include/__pstl/internal/parallel_impl.h
-libcxx/include/__pstl/internal/pstl_config.h
 libcxx/include/__pstl/internal/unseq_backend_simd.h
 libcxx/include/__pstl/internal/utils.h
 libcxx/include/queue