diff --git a/cmake/myx/MyxCMakeConfig.cmake b/cmake/myx/MyxCMakeConfig.cmake
index 164bd2a..43c3934 100644
--- a/cmake/myx/MyxCMakeConfig.cmake
+++ b/cmake/myx/MyxCMakeConfig.cmake
@@ -50,6 +50,7 @@ include(${MYX_CMAKE_LIB_DIR}/NinjaGeneratorWarning.cmake)
 include(${MYX_CMAKE_LIB_DIR}/DirectoriesGuards.cmake)
 include(${MYX_CMAKE_LIB_DIR}/SemanticProjectVersion.cmake)
 include(${MYX_CMAKE_LIB_DIR}/NinjaGeneratorWrapper.cmake)
+include(${MYX_CMAKE_LIB_DIR}/AddExternalTarget.cmake)
 include(${MYX_CMAKE_LIB_DIR}/FetchContentAdd.cmake)
 
 set(MYX_CMAKE_TOOLCHAINS_DIR "${MYX_CMAKE_LIB_DIR}/toolchains")
diff --git a/cmake/myx/MyxCMakeConfigVersion.cmake b/cmake/myx/MyxCMakeConfigVersion.cmake
index bf1a2df..cc0431b 100644
--- a/cmake/myx/MyxCMakeConfigVersion.cmake
+++ b/cmake/myx/MyxCMakeConfigVersion.cmake
@@ -1,4 +1,4 @@
-set(MYX_CMAKE_PACKAGE_VERSION "2.2.6")
+set(MYX_CMAKE_PACKAGE_VERSION "2.3.1")
 if(MYX_CMAKE_PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
   set(PACKAGE_VERSION_COMPATIBLE FALSE)
 else()
diff --git a/cmake/myx/lib/AddExternalTarget.cmake b/cmake/myx/lib/AddExternalTarget.cmake
new file mode 100644
index 0000000..9148a53
--- /dev/null
+++ b/cmake/myx/lib/AddExternalTarget.cmake
@@ -0,0 +1,79 @@
+#[=======================================================================[.rst:
+myx_add_external_target
+-----------------------
+
+Функция для подключения целей из внешних проектов::
+
+  myx_add_external_target(TARGET_NAME
+    [ MODULES_PATH modules_path ] |
+    [ GIT_REPOSITORY url ] |
+    [ GIT_TAG tag ] |
+    [ LOCAL_PATH local_path ] )
+
+Обязательный параметр: `TARGET_NAME` - имя цели, содержащейся во внешнем проекте.
+Параметр `MODULES_PATH` содержит имя каталога, в который будут загружаться
+внешние проекты (по умлолчанию `modules`). Параметр `GIT_REPOSITORY` содержит
+адрес внешнего проекта, который нужно загрузить с помощью git. Параметр `GIT_TAG`
+содержит используемые метку, идентификатор коммита или ветку в репозитории.
+Параметр `LOCAL_PATH` используется для указания пути к подкаталогу, находящемуся
+вне текущего проекта. Его следует указывать только при вызове функции из
+вспомогательного файла `external_targets.cmake`.
+
+#]=======================================================================]
+
+
+find_package(Git)
+
+function(myx_add_external_target TARGET_NAME)
+  set(options)
+  set(oneValueArgs)
+  set(multiValueArgs MODULES_PATH GIT_REPOSITORY GIT_TAG LOCAL_PATH)
+  cmake_parse_arguments(ARG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+  if(TARGET ${TARGET_NAME})
+    return()
+  endif()
+
+  if(ARG_LOCAL_PATH)
+    myx_message_notice("Using directory ${ARG_LOCAL_PATH} to build target ${TARGET_NAME}")
+    add_subdirectory(${ARG_LOCAL_PATH} ${CMAKE_BINARY_DIR}/${TARGET_NAME} EXCLUDE_FROM_ALL)
+    return()
+  endif()
+
+  if(NOT ARG_MODULES_PATH)
+    set(ARG_MODULES_PATH modules)
+  endif()
+
+  if(CMAKE_SCRIPT_MODE_FILE)
+    set(PROJECT_SOURCE_DIR ${CMAKE_SOURCE_DIR})
+  endif()
+  set(ARG_MODULES_PATH ${PROJECT_SOURCE_DIR}/${ARG_MODULES_PATH})
+
+  if(NOT IS_DIRECTORY ${ARG_MODULES_PATH})
+    execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${ARG_MODULES_PATH})
+  endif()
+
+  if(GIT_EXECUTABLE)
+    if(NOT IS_DIRECTORY ${ARG_MODULES_PATH}/${TARGET_NAME})
+      execute_process(COMMAND ${GIT_EXECUTABLE} clone ${ARG_GIT_REPOSITORY} ${TARGET_NAME}
+        WORKING_DIRECTORY ${ARG_MODULES_PATH})
+    else()
+      execute_process(COMMAND ${GIT_EXECUTABLE} fetch
+        WORKING_DIRECTORY ${ARG_MODULES_PATH}/${TARGET_NAME})
+    endif()
+    execute_process(COMMAND ${GIT_EXECUTABLE} checkout ${ARG_GIT_TAG}
+      WORKING_DIRECTORY ${ARG_MODULES_PATH}/${TARGET_NAME})
+  endif()
+
+  if(NOT CMAKE_SCRIPT_MODE_FILE)
+    add_subdirectory(${ARG_MODULES_PATH}/${TARGET_NAME} EXCLUDE_FROM_ALL)
+  endif()
+
+  if(NOT TARGET ${TARGET_NAME})
+    myx_message_fatal_error("Target ${TARGET_NAME} is not found.")
+  endif()
+
+endfunction(myx_add_external_target)
+
+include("${PROJECT_SOURCE_DIR}/external_targets.cmake" OPTIONAL)
+
diff --git a/cmake/myx/lib/AddObjectLibrary.cmake b/cmake/myx/lib/AddObjectLibrary.cmake
index 2fc2443..27de4b7 100644
--- a/cmake/myx/lib/AddObjectLibrary.cmake
+++ b/cmake/myx/lib/AddObjectLibrary.cmake
@@ -19,9 +19,6 @@ myx_add_object_library
 
 include_guard(GLOBAL)
 
-include(CMakePackageConfigHelpers)
-include(GenerateExportHeader)
-
 if(${CMAKE_VERSION} VERSION_LESS "3.17.0")
   set(MYX_CMAKE_LIB_DIR_BACKPORT "${CMAKE_CURRENT_LIST_DIR}")
 endif()
@@ -31,6 +28,9 @@ function(myx_add_object_library TARGET_NAME)
     set(CMAKE_CURRENT_FUNCTION_LIST_DIR ${MYX_CMAKE_LIB_DIR_BACKPORT})
   endif()
 
+  include(CMakePackageConfigHelpers)
+  include(GenerateExportHeader)
+
   set(options)
   set(oneValueArgs OUTPUT_NAME EXPORT_FILE_NAME EXPORT_BASE_NAME)
   set(multiValueArgs)
diff --git a/cmake/myx_setup.cmake b/cmake/myx_setup.cmake
index 86a7371..ce2817e 100644
--- a/cmake/myx_setup.cmake
+++ b/cmake/myx_setup.cmake
@@ -20,11 +20,11 @@ if(ENV{MYX_CMAKE_DIR})
   set(MYX_CMAKE_DIR $ENV{MYX_CMAKE_DIR})
 endif()
 if(MYX_CMAKE_DIR)
-  find_package(MyxCMake 2.2.6 REQUIRED CONFIG PATHS ${MYX_CMAKE_DIR} NO_DEFAULT_PATH)
+  find_package(MyxCMake 2.3.1 REQUIRED CONFIG PATHS ${MYX_CMAKE_DIR} NO_DEFAULT_PATH)
   myx_message_notice("=== MyxCMake directory: ${MyxCMake_CONFIG} ===")
 else()
   if(MYX_CMAKE_USE_SYSTEM)
-    find_package(MyxCMake 2.2.6 REQUIRED)
+    find_package(MyxCMake 2.3.1 REQUIRED)
     myx_message_notice("=== MyxCMake directory: ${MyxCMake_CONFIG} ===")
   else()
     include(${PROJECT_SOURCE_DIR}/cmake/myx/MyxCMakeConfig.cmake)