diff --git a/libcxx/cmake/caches/AIX.cmake b/libcxx/cmake/caches/AIX.cmake
new file mode 100644
--- /dev/null
+++ b/libcxx/cmake/caches/AIX.cmake
@@ -0,0 +1,21 @@
+set(CMAKE_BUILD_TYPE Release CACHE STRING "")
+set(CMAKE_BUILD_WITH_INSTALL_RPATH ON CACHE BOOL "")
+set(CMAKE_C_FLAGS "-D_ALL_SOURCE -mignore-xcoff-visibility" CACHE STRING "")
+set(CMAKE_CXX_FLAGS "-D_ALL_SOURCE -mignore-xcoff-visibility" CACHE STRING "")
+set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-G -Wl,-bcdtors:all:-2147483548:s" CACHE STRING "")
+
+set(LIBCXX_ABI_VERSION "1" CACHE STRING "")
+set(LIBCXX_ENABLE_ASSERTIONS OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXX_ENABLE_STATIC OFF CACHE BOOL "")
+set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
+set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
+
+set(LIBCXXABI_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXXABI_ENABLE_STATIC OFF CACHE BOOL "")
+set(LIBCXXABI_USE_LLVM_UNWINDER ON CACHE BOOL "")
+
+set(LIBUNWIND_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBUNWIND_ENABLE_STATIC OFF CACHE BOOL "")
diff --git a/libcxx/utils/ci/aix-install-libcxx.sh b/libcxx/utils/ci/aix-install-libcxx.sh
new file mode 100755
--- /dev/null
+++ b/libcxx/utils/ci/aix-install-libcxx.sh
@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+#===----------------------------------------------------------------------===##
+#
+# 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
+#
+#===----------------------------------------------------------------------===##
+
+set -e
+
+PROGNAME="$(basename "${0}")"
+
+function error() {
+  printf "error: %s\n" "$*"
+  exit 1
+}
+
+function usage() {
+cat <<EOF
+Usage:
+${PROGNAME} [options]
+
+[-h|--help]                  Display this help and exit.
+
+--llvm-root <DIR>            Path to the root of the LLVM monorepo. Only the libcxx,
+                             libcxxabi and libunwind directories are required.
+
+--build-dir <DIR>            Path to the directory to use for building. This will
+                             contain intermediate build products.
+
+--clobber                    Remove the build and install directories before building.
+
+--install-dir <DIR>          Path to the directory to install the library to.
+
+--cache <PATH>               The CMake cache to use to control how the library gets built.
+EOF
+}
+
+function realpath() {
+  if [[ $1 = /* ]]; then echo "$1"; else echo "$(pwd)/${1#./}"; fi
+}
+
+function parse_args() {
+  while [[ $# -gt 0 ]]; do
+    case ${1} in
+      -h|--help)
+        usage
+        exit 0
+        ;;
+      --llvm-root)
+        llvm_root="${2}"
+        shift
+        ;;
+      --build-dir)
+        build_dir="${2}"
+        shift
+        ;;
+      --clobber)
+        clobber=1
+        ;;
+      --install-dir)
+        install_dir="${2}"
+        shift
+        ;;
+      --cache)
+        cache="${2}"
+        shift
+        ;;
+      *)
+        error "Unknown argument '${1}'"
+        ;;
+    esac
+    shift
+  done
+
+  for arg in llvm_root build_dir install_dir cache; do
+    if [ -z ${!arg+x} ]; then
+      error "Missing required argument '--${arg//_/-}'"
+    elif [ "${!arg}" == "" ]; then
+      error "Argument to --${arg//_/-} must not be empty"
+    fi
+  done
+
+  # Allow using relative paths
+  for arg in llvm_root build_dir install_dir cache; do
+    path="$(realpath "${!arg}")"
+    eval "${arg}=\"${path}\""
+  done
+}
+
+function step() {
+  separator="$(printf "%0.s-" $(seq 1 ${#1}))"
+  echo
+  echo "${separator}"
+  echo "${1}"
+  echo "${separator}"
+}
+
+function configure_and_build() {
+  for bitmode in 32 64; do
+    step "Building libc++.a, libc++abi.a and libunwind.a for ${bitmode}-bit"
+    [[ ! -d "${build_dir}/${bitmode}" ]] && mkdir -p "${build_dir}/${bitmode}"
+    [[ ! -e "${build_dir}/${bitmode}/build.ninja" ]] && \
+      (cd "${build_dir}/${bitmode}" &&
+        env OBJECT_MODE="${bitmode}" cmake "${llvm_root}/llvm" \
+          -C "${cache}" \
+          -GNinja \
+          -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi;libunwind" \
+          -DCMAKE_INSTALL_PREFIX="${build_dir}/${bitmode}-install"
+      )
+    env OBJECT_MODE="${bitmode}" cmake --build "${build_dir}/${bitmode}" --target install-cxx install-cxxabi install-unwind
+  done
+}
+
+function merge_libraries() {
+  local libs="libc++ libc++abi libunwind"
+
+  step "Merging the resulting 32-bit and 64-bit libc++.a, libc++abi.a and libunwind.a into single libraries"
+  mkdir -p "${install_dir}/lib"
+
+
+  cd "${install_dir}/lib"
+  for lib in ${libs}; do
+    cp "${build_dir}/32/lib/${lib}.a" .
+    ar -X64 -x "${build_dir}/64/lib/${lib}.a"
+    ar -X64 r "${lib}.a" "${lib}.so.1"
+    rm "${lib}.so.1"
+  done
+}
+
+function install() {
+  # Install the headers by copying the headers from one of the builds into the
+  # install directory. Headers from both bitmodes should be the same.
+  local libs="libcxx libcxxabi libunwind"
+
+  step "Installing the libc++, libc++abi and libunwind headers to ${install_dir}/include"
+  mkdir -p "${install_dir}"
+  cp -r "${build_dir}/32-install/include" "${install_dir}"
+  [[ ! -d "${install_dir}/include/c++/v1" ]] && error "${install_dir}/include/c++/v1 was not created during install"
+  cp -r "${llvm_root}/libcxxabi/include/"* "${install_dir}/include/c++/v1" # TODO: libcxxabi should install its headers in CMake
+
+  step "Installing the libc++, libc++abi and libunwind licenses"
+  mkdir -p "${install_dir}/notices"
+  for lib in ${libs}; do
+    cp "${llvm_root}/${lib}/LICENSE.TXT" "${install_dir}/notices/${lib}.txt"
+  done
+}
+
+function main() {
+  parse_args "$@"
+
+  [[ -n "${clobber}" ]] && rm -rf "${build_dir}" && rm -rf "${install_dir}"
+
+  configure_and_build
+  merge_libraries
+  install
+}
+
+main "$@"