Integrate CMake Package Manager.

CMakeLists.txt

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+# Define what CMake versions this project targets.
+cmake_minimum_required(VERSION 3.18..3.29)
+
+# Define our project.
+project(ReWalker
+    VERSION 1.0
+    LANGUAGES CXX)
+
+# Prevent building in main directory, it generates lots of clutter!
+if (PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
+    message(FATAL_ERROR "In-source builds are not allowed")
+endif()
+
+# Set C++ version
+set(CMAKE_CXX_STANDARD 20)
+
+# Set optimization level
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0")
+
+# Include addon scripts from the 'cmake' directory
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+# Include CMake Package Manager
+include(cmake/CPM.cmake)
+
+# Automatically clone, compile and link the ReWindow library.
+# You specify the release name to target against. See the link below for releases:
+# https://git.redacted.cc/Redacted/ReWindow/releases
+
+CPMAddPackage(
+        NAME ReWindow
+        URL URL https://git.redacted.cc/Redacted/ReWindow/archive/Prerelease-31.zip
+)
+
+add_executable(ReWalkerApp test.cpp)
+
+
+target_include_directories(ReWalkerApp PUBLIC ${ReWindow_SOURCE_DIR}/include ${J3ML_SOURCE_DIR}/include)
+
+target_link_libraries(ReWalkerApp PUBLIC J3ML ReWindowLibrary)

cmake/CPM.cmake

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+# SPDX-License-Identifier: MIT
+#
+# SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
+
+set(CPM_DOWNLOAD_VERSION 0.38.7)
+set(CPM_HASH_SUM "83e5eb71b2bbb8b1f2ad38f1950287a057624e385c238f6087f94cdfc44af9c5")
+
+if(CPM_SOURCE_CACHE)
+    set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+elseif(DEFINED ENV{CPM_SOURCE_CACHE})
+    set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+else()
+    set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+endif()
+
+# Expand relative path. This is important if the provided path contains a tilde (~)
+get_filename_component(CPM_DOWNLOAD_LOCATION ${CPM_DOWNLOAD_LOCATION} ABSOLUTE)
+
+file(DOWNLOAD
+        https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
+        ${CPM_DOWNLOAD_LOCATION} EXPECTED_HASH SHA256=${CPM_HASH_SUM}
+)
+
+include(${CPM_DOWNLOAD_LOCATION})