diff --git a/CMakeLists.txt b/CMakeLists.txt
index 24c4f79..d745fb3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,12 +1,30 @@
-cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.21 FATAL_ERROR)
 
-if(NOT DEFINED PROJECT_NAME)
-    set(BUILD_AS_STANDALONE ON)
-else()
-    set(BUILD_AS_STANDALONE OFF)
-endif()
+#
+# VERSION
+#
 
-project(meta.hpp)
+file(READ headers/meta.hpp/meta_base/base.hpp META_HPP_BASE_FILE)
+
+string(REGEX MATCH "#define[ ]+META_HPP_VERSION_MAJOR[ ]+([0-9]+)" _ ${META_HPP_BASE_FILE})
+set(META_HPP_VERSION_MAJOR "${CMAKE_MATCH_1}")
+
+string(REGEX MATCH "#define[ ]+META_HPP_VERSION_MINOR[ ]+([0-9]+)" _ ${META_HPP_BASE_FILE})
+set(META_HPP_VERSION_MINOR "${CMAKE_MATCH_1}")
+
+string(REGEX MATCH "#define[ ]+META_HPP_VERSION_PATCH[ ]+([0-9]+)" _ ${META_HPP_BASE_FILE})
+set(META_HPP_VERSION_PATCH "${CMAKE_MATCH_1}")
+
+set(META_HPP_VERSION ${META_HPP_VERSION_MAJOR}.${META_HPP_VERSION_MINOR}.${META_HPP_VERSION_PATCH})
+
+#
+# PROJECT
+#
+
+project(meta.hpp
+    VERSION ${META_HPP_VERSION}
+    DESCRIPTION "C++20 tiny dynamic reflection library"
+    HOMEPAGE_URL "https://github.com/blackmatov/meta.hpp")
 
 add_library(${PROJECT_NAME} INTERFACE)
 target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_20)
@@ -16,10 +34,10 @@ find_package(Threads REQUIRED)
 target_link_libraries(${PROJECT_NAME} INTERFACE Threads::Threads)
 
 #
-# BUILD_AS_STANDALONE
+# DEVELOPER
 #
 
-if(NOT ${BUILD_AS_STANDALONE})
+if(NOT PROJECT_IS_TOP_LEVEL)
     return()
 endif()
 
diff --git a/CMakePresets.json b/CMakePresets.json
index 8df8146..1e08e52 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -3,7 +3,7 @@
 
     "cmakeMinimumRequired": {
         "major": 3,
-        "minor": 20,
+        "minor": 21,
         "patch": 0
     },
 
diff --git a/headers/meta.hpp/meta_all.hpp b/headers/meta.hpp/meta_all.hpp
index 070501d..6f2eacd 100644
--- a/headers/meta.hpp/meta_all.hpp
+++ b/headers/meta.hpp/meta_all.hpp
@@ -9,7 +9,6 @@
 #include "meta_base.hpp"
 
 #include "meta_binds.hpp"
-
 #include "meta_binds/array_bind.hpp"
 #include "meta_binds/class_bind.hpp"
 #include "meta_binds/enum_bind.hpp"
diff --git a/headers/meta.hpp/meta_base.hpp b/headers/meta.hpp/meta_base.hpp
index 0840599..ed6d76b 100644
--- a/headers/meta.hpp/meta_base.hpp
+++ b/headers/meta.hpp/meta_base.hpp
@@ -6,34 +6,7 @@
 
 #pragma once
 
-#include <cassert>
-#include <cstddef>
-#include <cstdint>
-#include <cstdlib>
-
-#include <algorithm>
-#include <array>
-#include <atomic>
-#include <concepts>
-#include <functional>
-#include <initializer_list>
-#include <iosfwd>
-#include <map>
-#include <memory>
-#include <mutex>
-#include <set>
-#include <span>
-#include <stdexcept>
-#include <string_view>
-#include <string>
-#include <tuple>
-#include <type_traits>
-#include <typeindex>
-#include <typeinfo>
-#include <utility>
-#include <variant>
-#include <vector>
-
+#include "meta_base/base.hpp"
 #include "meta_base/bitflags.hpp"
 #include "meta_base/cv_traits.hpp"
 #include "meta_base/cvref_traits.hpp"
@@ -48,14 +21,6 @@
 #include "meta_base/type_kinds.hpp"
 #include "meta_base/type_list.hpp"
 
-#if !defined(__cpp_exceptions)
-#  define META_HPP_NO_EXCEPTIONS
-#endif
-
-#if !defined(__cpp_rtti)
-#  define META_HPP_NO_RTTI
-#endif
-
 namespace meta_hpp
 {
     using detail::select_const;
diff --git a/headers/meta.hpp/meta_base/base.hpp b/headers/meta.hpp/meta_base/base.hpp
new file mode 100644
index 0000000..47e96a5
--- /dev/null
+++ b/headers/meta.hpp/meta_base/base.hpp
@@ -0,0 +1,47 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021-2022, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#pragma once
+
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+
+#include <algorithm>
+#include <array>
+#include <atomic>
+#include <concepts>
+#include <functional>
+#include <initializer_list>
+#include <iosfwd>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <set>
+#include <span>
+#include <stdexcept>
+#include <string_view>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <typeindex>
+#include <typeinfo>
+#include <utility>
+#include <variant>
+#include <vector>
+
+#define META_HPP_VERSION_MAJOR 0
+#define META_HPP_VERSION_MINOR 0
+#define META_HPP_VERSION_PATCH 1
+
+#if !defined(__cpp_exceptions)
+#  define META_HPP_NO_EXCEPTIONS
+#endif
+
+#if !defined(__cpp_rtti)
+#  define META_HPP_NO_RTTI
+#endif
diff --git a/headers/meta.hpp/meta_base/bitflags.hpp b/headers/meta.hpp/meta_base/bitflags.hpp
index 90edcac..a297451 100644
--- a/headers/meta.hpp/meta_base/bitflags.hpp
+++ b/headers/meta.hpp/meta_base/bitflags.hpp
@@ -6,9 +6,7 @@
 
 #pragma once
 
-#include <functional>
-#include <type_traits>
-#include <utility>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/cv_traits.hpp b/headers/meta.hpp/meta_base/cv_traits.hpp
index 9e92401..97e3e74 100644
--- a/headers/meta.hpp/meta_base/cv_traits.hpp
+++ b/headers/meta.hpp/meta_base/cv_traits.hpp
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include <type_traits>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/cvref_traits.hpp b/headers/meta.hpp/meta_base/cvref_traits.hpp
index 0aef426..957d25a 100644
--- a/headers/meta.hpp/meta_base/cvref_traits.hpp
+++ b/headers/meta.hpp/meta_base/cvref_traits.hpp
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include <type_traits>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/fixed_function.hpp b/headers/meta.hpp/meta_base/fixed_function.hpp
index 0cfc6a8..0e72313 100644
--- a/headers/meta.hpp/meta_base/fixed_function.hpp
+++ b/headers/meta.hpp/meta_base/fixed_function.hpp
@@ -6,14 +6,7 @@
 
 #pragma once
 
-#include <cassert>
-#include <cstddef>
-
-#include <concepts>
-#include <functional>
-#include <memory>
-#include <type_traits>
-#include <utility>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/hash_combiner.hpp b/headers/meta.hpp/meta_base/hash_combiner.hpp
index e228c45..05b09bc 100644
--- a/headers/meta.hpp/meta_base/hash_combiner.hpp
+++ b/headers/meta.hpp/meta_base/hash_combiner.hpp
@@ -6,8 +6,7 @@
 
 #pragma once
 
-#include <cstddef>
-#include <functional>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/is_in_place_type.hpp b/headers/meta.hpp/meta_base/is_in_place_type.hpp
index b9c0648..edbb08b 100644
--- a/headers/meta.hpp/meta_base/is_in_place_type.hpp
+++ b/headers/meta.hpp/meta_base/is_in_place_type.hpp
@@ -6,8 +6,7 @@
 
 #pragma once
 
-#include <type_traits>
-#include <utility>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/noncopyable.hpp b/headers/meta.hpp/meta_base/noncopyable.hpp
index 7b3a84c..c9608bc 100644
--- a/headers/meta.hpp/meta_base/noncopyable.hpp
+++ b/headers/meta.hpp/meta_base/noncopyable.hpp
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include "base.hpp"
+
 namespace meta_hpp::detail
 {
     class noncopyable {
diff --git a/headers/meta.hpp/meta_base/overloaded.hpp b/headers/meta.hpp/meta_base/overloaded.hpp
index 0ae408d..3839775 100644
--- a/headers/meta.hpp/meta_base/overloaded.hpp
+++ b/headers/meta.hpp/meta_base/overloaded.hpp
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include "base.hpp"
+
 namespace meta_hpp::detail
 {
     template < typename... Ts >
diff --git a/headers/meta.hpp/meta_base/select_overload.hpp b/headers/meta.hpp/meta_base/select_overload.hpp
index 8a275ef..818926f 100644
--- a/headers/meta.hpp/meta_base/select_overload.hpp
+++ b/headers/meta.hpp/meta_base/select_overload.hpp
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include "base.hpp"
+
 namespace meta_hpp::detail
 {
     template < typename C, typename R, typename... Args >
diff --git a/headers/meta.hpp/meta_base/to_underlying.hpp b/headers/meta.hpp/meta_base/to_underlying.hpp
index f4bd77f..57545f5 100644
--- a/headers/meta.hpp/meta_base/to_underlying.hpp
+++ b/headers/meta.hpp/meta_base/to_underlying.hpp
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include <type_traits>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/type_id.hpp b/headers/meta.hpp/meta_base/type_id.hpp
index ddcfe97..bf85eb7 100644
--- a/headers/meta.hpp/meta_base/type_id.hpp
+++ b/headers/meta.hpp/meta_base/type_id.hpp
@@ -6,10 +6,7 @@
 
 #pragma once
 
-#include <atomic>
-#include <cstdint>
-#include <functional>
-
+#include "base.hpp"
 #include "type_list.hpp"
 
 namespace meta_hpp::detail
diff --git a/headers/meta.hpp/meta_base/type_kinds.hpp b/headers/meta.hpp/meta_base/type_kinds.hpp
index ea72011..fd02438 100644
--- a/headers/meta.hpp/meta_base/type_kinds.hpp
+++ b/headers/meta.hpp/meta_base/type_kinds.hpp
@@ -6,8 +6,7 @@
 
 #pragma once
 
-#include <cstdint>
-#include <type_traits>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/headers/meta.hpp/meta_base/type_list.hpp b/headers/meta.hpp/meta_base/type_list.hpp
index 43684b3..6063edd 100644
--- a/headers/meta.hpp/meta_base/type_list.hpp
+++ b/headers/meta.hpp/meta_base/type_list.hpp
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include <tuple>
+#include "base.hpp"
 
 namespace meta_hpp::detail
 {
diff --git a/singles/headers/meta.hpp/meta_all.hpp b/singles/headers/meta.hpp/meta_all.hpp
index 541a989..0657eee 100644
--- a/singles/headers/meta.hpp/meta_all.hpp
+++ b/singles/headers/meta.hpp/meta_all.hpp
@@ -31,6 +31,18 @@
 #include <variant>
 #include <vector>
 
+#define META_HPP_VERSION_MAJOR 0
+#define META_HPP_VERSION_MINOR 0
+#define META_HPP_VERSION_PATCH 1
+
+#if !defined(__cpp_exceptions)
+#  define META_HPP_NO_EXCEPTIONS
+#endif
+
+#if !defined(__cpp_rtti)
+#  define META_HPP_NO_RTTI
+#endif
+
 namespace meta_hpp::detail
 {
     template < typename Enum >
@@ -718,14 +730,6 @@ namespace meta_hpp::detail
     }
 }
 
-#if !defined(__cpp_exceptions)
-#  define META_HPP_NO_EXCEPTIONS
-#endif
-
-#if !defined(__cpp_rtti)
-#  define META_HPP_NO_RTTI
-#endif
-
 namespace meta_hpp
 {
     using detail::select_const;