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+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Most widely used distributions have cmake 3.5 or greater available as of March
+# 2019.  A notable exception is RHEL-7 (CentOS7).  You can install a current
+# version of CMake by first installing Extra Packages for Enterprise Linux
+# (https://fedoraproject.org/wiki/EPEL#Extra_Packages_for_Enterprise_Linux_.28EPEL.29)
+# and then issuing `yum install cmake3` on the command line.
+cmake_minimum_required(VERSION 3.5)
+
+# Compiler id for Apple Clang is now AppleClang.
+if (POLICY CMP0025)
+  cmake_policy(SET CMP0025 NEW)
+endif (POLICY CMP0025)
+
+# if command can use IN_LIST
+if (POLICY CMP0057)
+  cmake_policy(SET CMP0057 NEW)
+endif (POLICY CMP0057)
+
+# Project version variables are the empty string if version is unspecified
+if (POLICY CMP0048)
+  cmake_policy(SET CMP0048 NEW)
+endif (POLICY CMP0048)
+
+# option() honor variables
+if (POLICY CMP0077)
+  cmake_policy(SET CMP0077 NEW)
+endif (POLICY CMP0077)
+
+project(absl CXX)
+
+# Output directory is correct by default for most build setups. However, when
+# building Abseil as a DLL, it is important to have the DLL in the same
+# directory as the executable using it. Thus, we put all executables in a single
+# /bin directory.
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+
+# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
+# in the source tree of a project that uses it, install rules are disabled.
+if(NOT "^${CMAKE_SOURCE_DIR}$" STREQUAL "^${PROJECT_SOURCE_DIR}$")
+  option(ABSL_ENABLE_INSTALL "Enable install rule" OFF)
+else()
+  option(ABSL_ENABLE_INSTALL "Enable install rule" ON)
+endif()
+
+list(APPEND CMAKE_MODULE_PATH
+  ${CMAKE_CURRENT_LIST_DIR}/CMake
+  ${CMAKE_CURRENT_LIST_DIR}/absl/copts
+)
+
+# Linking Abseil to shared libraries (such as Nix) requires PIC.
+set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
+
+include(AbseilInstallDirs)
+include(CMakePackageConfigHelpers)
+include(AbseilDll)
+include(AbseilHelpers)
+
+
+##
+## Using absl targets
+##
+## all public absl targets are
+## exported with the absl:: prefix
+##
+## e.g absl::base absl::synchronization absl::strings ....
+##
+## DO NOT rely on the internal targets outside of the prefix
+
+
+# include current path
+list(APPEND ABSL_COMMON_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
+
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+  set(ABSL_USING_CLANG ON)
+else()
+  set(ABSL_USING_CLANG OFF)
+endif()
+
+# find dependencies
+## pthread
+find_package(Threads REQUIRED)
+
+option(ABSL_USE_EXTERNAL_GOOGLETEST
+  "If ON, Abseil will assume that the targets for GoogleTest are already provided by the including project. This makes sense when Abseil is used with add_subproject." OFF)
+
+option(ABSL_USE_GOOGLETEST_HEAD
+  "If ON, abseil will download HEAD from GoogleTest at config time." OFF)
+
+set(ABSL_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL")
+
+set(ABSL_LOCAL_GOOGLETEST_DIR "/usr/src/googletest" CACHE PATH
+  "If ABSL_USE_GOOGLETEST_HEAD is OFF and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout."
+  )
+
+option(ABSL_RUN_TESTS "If ON, Abseil tests will be run." OFF)
+
+if(${ABSL_RUN_TESTS})
+  # enable CTest.  This will set BUILD_TESTING to ON unless otherwise specified
+  # on the command line
+  include(CTest)
+
+  ## check targets
+  if (NOT ABSL_USE_EXTERNAL_GOOGLETEST)
+    set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
+    if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL)
+      message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL")
+    endif()
+    if(ABSL_USE_GOOGLETEST_HEAD)
+      set(absl_gtest_download_url "https://github.com/google/googletest/archive/master.zip")
+    elseif(ABSL_GOOGLETEST_DOWNLOAD_URL)
+      set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL})
+    endif()
+    if(absl_gtest_download_url)
+      set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
+    else()
+      set(absl_gtest_src_dir ${ABSL_LOCAL_GOOGLETEST_DIR})
+    endif()
+    include(CMake/Googletest/DownloadGTest.cmake)
+  endif()
+
+  check_target(gtest)
+  check_target(gtest_main)
+  check_target(gmock)
+
+  list(APPEND ABSL_TEST_COMMON_LIBRARIES
+    gtest_main
+    gtest
+    gmock
+    ${CMAKE_THREAD_LIBS_INIT}
+  )
+endif()
+
+add_subdirectory(absl)
+
+if(ABSL_ENABLE_INSTALL)
+  # absl:lts-remove-begin(system installation is supported for LTS releases)
+  # We don't support system-wide installation
+  list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${PROJECT_NAME}")
+  if(NOT DEFINED CMAKE_INSTALL_PREFIX OR CMAKE_INSTALL_PREFIX IN_LIST SYSTEM_INSTALL_DIRS)
+    message(WARNING "\
+  The default and system-level install directories are unsupported except in LTS \
+  releases of Abseil.  Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
+  source or build tree directly.\
+    ")
+  endif()
+  # absl:lts-remove-end
+
+  # install as a subdirectory only
+  install(EXPORT ${PROJECT_NAME}Targets
+    NAMESPACE absl::
+    DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+  )
+
+  configure_package_config_file(
+    CMake/abslConfig.cmake.in
+    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+    INSTALL_DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+  )
+  install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+    DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+  )
+
+  # Abseil only has a version in LTS releases.  This mechanism is accomplished
+  # Abseil's internal Copybara (https://github.com/google/copybara) workflows and
+  # isn't visible in the CMake buildsystem itself.
+  if(absl_VERSION)
+    write_basic_package_version_file(
+      "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
+      COMPATIBILITY ExactVersion
+    )
+
+    install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
+      DESTINATION ${ABSL_INSTALL_CONFIGDIR}
+    )
+  endif()  # absl_VERSION
+
+  install(DIRECTORY absl
+    DESTINATION ${ABSL_INSTALL_INCLUDEDIR}
+    FILES_MATCHING
+      PATTERN "*.inc"
+      PATTERN "*.h"
+      PATTERN "copts" EXCLUDE
+      PATTERN "testdata" EXCLUDE
+    )
+endif()  # ABSL_ENABLE_INSTALL