CPM was added to CMake

.gitignore

@@ -0,0 +1 @@
+build/

CMakeLists.txt

@@ -2,10 +2,10 @@ cmake_minimum_required(VERSION 3.12)
 
 project(cyberiadaml VERSION 1.0)
 
-find_package(LibXml2 REQUIRED)
-if(!LibXml2_FOUND)
-	message(FATAL_ERROR "Cannot find libxml2 library")
-endif()
+include(cmake/CPM.cmake)
+
+CPMUsePackageLock(package-lock.cmake)
+CPMAddPackage("gh:GNOME/libxml2@2.13.2")
 
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D__DEBUG__")
 

cmake/CPM.cmake

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: MIT
+#
+# SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
+
+set(CPM_DOWNLOAD_VERSION 0.40.0)
+set(CPM_HASH_SUM "7b354f3a5976c4626c876850c93944e52c83ec59a159ae5de5be7983f0e17a2a")
+
+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})