diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2275d3b..8cac31e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,24 +4,26 @@
 # Distributed under the Boost Software License, Version 1.0.
 # https://www.boost.org/LICENSE_1_0.txt
 
-cmake_minimum_required(VERSION 3.5...4.20)
+cmake_minimum_required(VERSION 3.5...4.4)
 
 project(boost_type_index VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
-if (BOOST_USE_MODULES)
-    add_library(boost_type_index)
-    target_sources(boost_type_index
-      PUBLIC
+if(BOOST_USE_MODULES)
+    add_library(boost_type_index STATIC)
+    target_sources(boost_type_index PUBLIC
         FILE_SET CXX_MODULES
-        BASE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}"
-        FILES "${CMAKE_CURRENT_SOURCE_DIR}/modules/boost_type_index.cppm"
+            BASE_DIRS modules
+            FILES "modules/boost_type_index.cppm"
     )
 
     target_compile_features(boost_type_index PUBLIC cxx_std_20)
     target_compile_definitions(boost_type_index PUBLIC BOOST_USE_MODULES)
-    if ((CMAKE_CXX_STANDARD IN_LIST CMAKE_CXX_COMPILER_IMPORT_STD) AND CMAKE_CXX_MODULE_STD)
-        target_compile_features(boost_type_index PRIVATE cxx_std_23)
-        target_compile_definitions(boost_type_index PRIVATE BOOST_TYPE_INDEX_USE_STD_MODULE)
+    if(NOT CMAKE_CXX_STANDARD)
+        set(CMAKE_CXX_STANDARD 20)
+    endif()
+    if(CMAKE_CXX_MODULE_STD AND CMAKE_CXX_STANDARD IN_LIST CMAKE_CXX_COMPILER_IMPORT_STD)
+        target_compile_features(boost_type_index PUBLIC cxx_std_23)
+        target_compile_definitions(boost_type_index PUBLIC BOOST_TYPE_INDEX_USE_STD_MODULE)
         message(STATUS "Using `import std;`")
     else()
         message(STATUS "`import std;` is not available")