diff --git a/CMakeLists.txt b/CMakeLists.txt
index eac4486..c9c5995 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,23 +1,32 @@
-# Copyright 2018, 2019 Peter Dimov
+# Generated by `boostdep --cmake timer`
+# Copyright 2020, 2021 Peter Dimov
 # Distributed under the Boost Software License, Version 1.0.
-# See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
+# https://www.boost.org/LICENSE_1_0.txt
 
-cmake_minimum_required(VERSION 3.5...3.16)
+cmake_minimum_required(VERSION 3.5...3.20)
 
 project(boost_timer VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
 add_library(boost_timer
-    src/auto_timers_construction.cpp
-    src/cpu_timer.cpp
+  src/auto_timers_construction.cpp
+  src/cpu_timer.cpp
 )
 
 add_library(Boost::timer ALIAS boost_timer)
 
 target_include_directories(boost_timer PUBLIC include)
 
-target_compile_definitions(boost_timer
+target_link_libraries(boost_timer
   PUBLIC
-    BOOST_TIMER_NO_LIB
+    Boost::config
+  PRIVATE
+    Boost::io
+    Boost::predef
+)
+
+target_compile_definitions(boost_timer
+  PUBLIC BOOST_TIMER_NO_LIB
+  PRIVATE BOOST_TIMER_SOURCE
 )
 
 if(BUILD_SHARED_LIBS)
@@ -26,20 +35,8 @@ else()
   target_compile_definitions(boost_timer PUBLIC BOOST_TIMER_STATIC_LINK)
 endif()
 
-target_link_libraries(boost_timer
-  PUBLIC
-    Boost::config
-    Boost::core
-    Boost::system
-  PRIVATE
-    Boost::chrono
-    Boost::io
-    Boost::predef
-    Boost::throw_exception
-)
+if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
 
-if(BUILD_TESTING)
-
-    add_subdirectory(test)
+  add_subdirectory(test)
 
 endif()