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diff --git a/deps/libchdr/deps/zstd-1.5.5/build/cmake/CMakeLists.txt b/deps/libchdr/deps/zstd-1.5.5/build/cmake/CMakeLists.txt
new file mode 100644
index 00000000..0bffc87d
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/build/cmake/CMakeLists.txt
@@ -0,0 +1,212 @@
+# ################################################################
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# ################################################################
+
+cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
+
+# As of 2018-12-26 ZSTD has been validated to build with cmake version 3.13.2 new policies.
+# Set and use the newest cmake policies that are validated to work
+set(ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION "3")
+set(ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION "13") #Policies never changed at PATCH level
+if("${CMAKE_MAJOR_VERSION}" LESS 3)
+  set(ZSTD_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
+elseif( "${ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION}" EQUAL "${CMAKE_MAJOR_VERSION}" AND
+        "${ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION}" GREATER "${CMAKE_MINOR_VERSION}")
+    set(ZSTD_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
+else()
+    set(ZSTD_CMAKE_POLICY_VERSION "${ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION}.${ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION}.0")
+endif()
+cmake_policy(VERSION ${ZSTD_CMAKE_POLICY_VERSION})
+
+set(CMAKE_BUILD_WITH_INSTALL_RPATH on)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules")
+set(ZSTD_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../..")
+set(LIBRARY_DIR ${ZSTD_SOURCE_DIR}/lib)
+# Parse version
+include(GetZstdLibraryVersion)
+GetZstdLibraryVersion(${LIBRARY_DIR}/zstd.h zstd_VERSION_MAJOR zstd_VERSION_MINOR zstd_VERSION_PATCH)
+
+if( CMAKE_MAJOR_VERSION LESS 3 )
+  ## Provide cmake 3+ behavior for older versions of cmake
+  project(zstd)
+  set(PROJECT_VERSION_MAJOR ${zstd_VERSION_MAJOR})
+  set(PROJECT_VERSION_MINOR ${zstd_VERSION_MINOR})
+  set(PROJECT_VERSION_PATCH ${zstd_VERSION_PATCH})
+  set(PROJECT_VERSION "${zstd_VERSION_MAJOR}.${zstd_VERSION_MINOR}.${zstd_VERSION_PATCH}")
+  enable_language(C)   # Main library is in C
+  enable_language(ASM) # And ASM
+  enable_language(CXX) # Testing contributed code also utilizes CXX
+else()
+  project(zstd
+    VERSION "${zstd_VERSION_MAJOR}.${zstd_VERSION_MINOR}.${zstd_VERSION_PATCH}"
+    LANGUAGES C   # Main library is in C
+              ASM # And ASM
+              CXX # Testing contributed code also utilizes CXX
+    )
+endif()
+message(STATUS "ZSTD VERSION: ${zstd_VERSION}")
+set(zstd_HOMEPAGE_URL "https://facebook.github.io/zstd")
+set(zstd_DESCRIPTION  "Zstandard is a real-time compression algorithm, providing high compression ratios.")
+
+# Set a default build type if none was specified
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  message(STATUS "Setting build type to 'Release' as none was specified.")
+  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
+  # Set the possible values of build type for cmake-gui
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
+endif()
+
+include(GNUInstallDirs)
+
+#-----------------------------------------------------------------------------
+# Add extra compilation flags
+#-----------------------------------------------------------------------------
+include(AddZstdCompilationFlags)
+ADD_ZSTD_COMPILATION_FLAGS()
+
+# Always hide XXHash symbols
+add_definitions(-DXXH_NAMESPACE=ZSTD_)
+
+#-----------------------------------------------------------------------------
+# Installation variables
+#-----------------------------------------------------------------------------
+message(STATUS "CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}")
+message(STATUS "CMAKE_INSTALL_LIBDIR: ${CMAKE_INSTALL_LIBDIR}")
+
+#-----------------------------------------------------------------------------
+# Options
+#-----------------------------------------------------------------------------
+
+# Legacy support
+option(ZSTD_LEGACY_SUPPORT "LEGACY SUPPORT" ON)
+
+if (ZSTD_LEGACY_SUPPORT)
+    message(STATUS "ZSTD_LEGACY_SUPPORT defined!")
+    set(ZSTD_LEGACY_LEVEL 5 CACHE STRING "")
+    add_definitions(-DZSTD_LEGACY_SUPPORT=${ZSTD_LEGACY_LEVEL})
+else ()
+    message(STATUS "ZSTD_LEGACY_SUPPORT not defined!")
+    add_definitions(-DZSTD_LEGACY_SUPPORT=0)
+endif ()
+
+if (ANDROID)
+    set(ZSTD_MULTITHREAD_SUPPORT_DEFAULT OFF)
+else()
+    set(ZSTD_MULTITHREAD_SUPPORT_DEFAULT ON)
+endif()
+
+# Multi-threading support
+option(ZSTD_MULTITHREAD_SUPPORT "MULTITHREADING SUPPORT" ${ZSTD_MULTITHREAD_SUPPORT_DEFAULT})
+
+if (ZSTD_MULTITHREAD_SUPPORT)
+    message(STATUS "ZSTD_MULTITHREAD_SUPPORT is enabled")
+else ()
+    message(STATUS "ZSTD_MULTITHREAD_SUPPORT is disabled")
+endif ()
+
+option(ZSTD_BUILD_PROGRAMS "BUILD PROGRAMS" ON)
+option(ZSTD_BUILD_CONTRIB "BUILD CONTRIB" OFF)
+
+# Respect the conventional CMake option for enabling tests if it was specified on the first configure
+if (BUILD_TESTING)
+    set(ZSTD_BUILD_TESTS_default ON)
+else()
+    set(ZSTD_BUILD_TESTS_default OFF)
+endif()
+option(ZSTD_BUILD_TESTS "BUILD TESTS" ${ZSTD_BUILD_TESTS_default})
+if (MSVC)
+    option(ZSTD_USE_STATIC_RUNTIME "LINK TO STATIC RUN-TIME LIBRARIES" OFF)
+endif ()
+
+#-----------------------------------------------------------------------------
+# External dependencies
+#-----------------------------------------------------------------------------
+if (ZSTD_MULTITHREAD_SUPPORT AND UNIX)
+    set(THREADS_PREFER_PTHREAD_FLAG ON)
+    find_package(Threads REQUIRED)
+    if(CMAKE_USE_PTHREADS_INIT)
+        set(THREADS_LIBS "${CMAKE_THREAD_LIBS_INIT}")
+    else()
+        message(SEND_ERROR "ZSTD currently does not support thread libraries other than pthreads")
+    endif()
+endif ()
+
+#-----------------------------------------------------------------------------
+# Add source directories
+#-----------------------------------------------------------------------------
+add_subdirectory(lib)
+
+option(ZSTD_PROGRAMS_LINK_SHARED "PROGRAMS LINK SHARED" OFF)
+
+if (ZSTD_BUILD_PROGRAMS)
+    if (NOT ZSTD_BUILD_STATIC AND NOT ZSTD_PROGRAMS_LINK_SHARED)
+        message(SEND_ERROR "You need to build static library to build zstd CLI")
+    elseif(NOT ZSTD_BUILD_SHARED AND ZSTD_PROGRAMS_LINK_SHARED)
+        message(SEND_ERROR "You need to build shared library to build zstd CLI")
+    endif ()
+
+    add_subdirectory(programs)
+endif ()
+
+if (ZSTD_BUILD_TESTS)
+    enable_testing()
+    if (NOT ZSTD_BUILD_STATIC)
+        message(SEND_ERROR "You need to build static library to build tests")
+    endif ()
+
+    add_subdirectory(tests)
+endif ()
+
+if (ZSTD_BUILD_CONTRIB)
+    add_subdirectory(contrib)
+endif ()
+
+#-----------------------------------------------------------------------------
+# Add clean-all target
+#-----------------------------------------------------------------------------
+add_custom_target(clean-all
+   COMMAND ${CMAKE_BUILD_TOOL} clean
+   COMMAND rm -rf ${CMAKE_BINARY_DIR}/
+)
+
+#-----------------------------------------------------------------------------
+# Generate Package Config files
+#
+# This section is based on the boiler plate code from:
+# https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#creating-packages
+#-----------------------------------------------------------------------------
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+    "${CMAKE_CURRENT_BINARY_DIR}/zstdConfigVersion.cmake"
+    VERSION ${zstd_VERSION}
+    COMPATIBILITY SameMajorVersion
+    )
+
+# A Package Config file that works from the build directory
+export(EXPORT zstdExports
+    FILE "${CMAKE_CURRENT_BINARY_DIR}/zstdTargets.cmake"
+    NAMESPACE zstd::
+    )
+configure_file(zstdConfig.cmake
+    "${CMAKE_CURRENT_BINARY_DIR}/zstdConfig.cmake"
+    COPYONLY
+    )
+
+# A Package Config file that works from the installation directory
+set(ConfigPackageLocation ${CMAKE_INSTALL_LIBDIR}/cmake/zstd)
+install(EXPORT zstdExports
+    FILE zstdTargets.cmake
+    NAMESPACE zstd::
+    DESTINATION ${ConfigPackageLocation}
+    )
+install(FILES
+    zstdConfig.cmake
+    "${CMAKE_CURRENT_BINARY_DIR}/zstdConfigVersion.cmake"
+    DESTINATION ${ConfigPackageLocation}
+    )