diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2ddc192b..269b225c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,6 +42,12 @@ endif()
 
 cmake_policy(PUSH)
 cmake_policy(VERSION ${CMAKE_MINIMUM_REQUIRED_VERSION})
+if(NOT CMAKE_VERSION VERSION_LESS 3.21)
+  cmake_policy(SET CMP0126 NEW)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS 3.17)
+  cmake_policy(SET CMP0102 NEW)
+endif()
 if(NOT CMAKE_VERSION VERSION_LESS 3.15)
   cmake_policy(SET CMP0091 NEW)
 endif()
@@ -52,6 +58,7 @@ if(NOT CMAKE_VERSION VERSION_LESS 3.12)
   cmake_policy(SET CMP0075 NEW)
 endif()
 if(NOT CMAKE_VERSION VERSION_LESS 3.9)
+  cmake_policy(SET CMP0068 NEW)
   cmake_policy(SET CMP0069 NEW)
   include(CheckIPOSupported)
   check_ipo_supported(RESULT CMAKE_INTERPROCEDURAL_OPTIMIZATION_AVAILABLE)
@@ -184,8 +191,9 @@ if(CMAKE_C_COMPILER_ID STREQUAL "MSVC" AND MSVC_VERSION LESS 1900)
     " At least 'Microsoft Visual Studio 2015' is required.")
 endif()
 
-set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
-set(THREADS_PREFER_PTHREAD_FLAG TRUE)
+if(NOT DEFINED THREADS_PREFER_PTHREAD_FLAG)
+  set(THREADS_PREFER_PTHREAD_FLAG TRUE)
+endif()
 find_package(Threads REQUIRED)
 
 include(cmake/utils.cmake)
diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index 58639a0e..ff9eb0dd 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -21,6 +21,25 @@ endif()
 
 cmake_policy(PUSH)
 cmake_policy(VERSION ${CMAKE_MINIMUM_REQUIRED_VERSION})
+if(NOT CMAKE_VERSION VERSION_LESS 3.21)
+  cmake_policy(SET CMP0126 NEW)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS 3.17)
+  cmake_policy(SET CMP0102 NEW)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS 3.15)
+  cmake_policy(SET CMP0091 NEW)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS 3.13)
+  cmake_policy(SET CMP0077 NEW)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS 3.12)
+  cmake_policy(SET CMP0075 NEW)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS 3.9)
+  cmake_policy(SET CMP0068 NEW)
+  cmake_policy(SET CMP0069 NEW)
+endif()
 
 if(CMAKE_VERSION MATCHES ".*MSVC.*" AND CMAKE_VERSION VERSION_LESS 3.16)
   message(FATAL_ERROR "CMake from MSVC kit is unfit! "