diff --git a/CMakeLists.txt b/CMakeLists.txt
index a131471a1f..fd17283f77 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8.12 FATAL_ERROR)
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/adm/cmake")
 
@@ -6,6 +6,26 @@ set (CMAKE_SUPPRESS_REGENERATION TRUE)
 
 set (CMAKE_CONFIGURATION_TYPES Release Debug RelWithDebInfo CACHE INTERNAL "" FORCE)
 
+# set using C++ standard
+set (BUILD_CPP_STANDARD "C++11" CACHE STRING "Select using c++ standard.")
+set_property(CACHE BUILD_CPP_STANDARD PROPERTY STRINGS "C++11" "C++14" "C++17" "C++20" "C++23")
+
+# Set desired C++ standard
+if     ("${BUILD_CPP_STANDARD}" STREQUAL "C++11")
+  set (CMAKE_CXX_STANDARD 11)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++14")
+  set (CMAKE_CXX_STANDARD 14)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++17")
+  set (CMAKE_CXX_STANDARD 17)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++20")
+  set (CMAKE_CXX_STANDARD 20)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++23")
+  set (CMAKE_CXX_STANDARD 23)
+else ()
+  message (FATAL_ERROR, "misprint in c++ standard name")
+endif()
+set (CMAKE_CXX_STANDARD_REQUIRED ON)
+
 # macro: include patched file if it exists
 macro (OCCT_INCLUDE_CMAKE_FILE BEING_INCLUDED_FILE)
   if (BUILD_PATCH AND EXISTS "${BUILD_PATCH}/${BEING_INCLUDED_FILE}.cmake")
diff --git a/adm/cmake/cotire.cmake b/adm/cmake/cotire.cmake
index a63f3ceaf3..b8b98a7119 100644
--- a/adm/cmake/cotire.cmake
+++ b/adm/cmake/cotire.cmake
@@ -32,15 +32,13 @@ if(__COTIRE_INCLUDED)
 endif()
 set(__COTIRE_INCLUDED TRUE)
 
-# call cmake_minimum_required, but prevent modification of the CMake policy stack in include mode
-# cmake_minimum_required also sets the policy version as a side effect, which we have to avoid
-if (NOT CMAKE_SCRIPT_MODE_FILE)
-	cmake_policy(PUSH)
-endif()
-cmake_minimum_required(VERSION 2.8.12)
-if (NOT CMAKE_SCRIPT_MODE_FILE)
-	cmake_policy(POP)
-endif()
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
 
 set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
 set (COTIRE_CMAKE_MODULE_VERSION "1.7.9")
diff --git a/adm/cmake/occt_defs_flags.cmake b/adm/cmake/occt_defs_flags.cmake
index dc20cc283b..33b50e8ce7 100644
--- a/adm/cmake/occt_defs_flags.cmake
+++ b/adm/cmake/occt_defs_flags.cmake
@@ -116,9 +116,9 @@ if (MSVC)
   else()
     set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
   endif()
-elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]"))
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
-  if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  if (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wshorten-64-to-32")
   endif()
   if (BUILD_SHARED_LIBS)
@@ -130,14 +130,10 @@ elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMP
   endif()
 endif()
 
-if ("x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xClang")
+if (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
   if (APPLE)
     # CLang can be used with both libstdc++ and libc++, however on OS X libstdc++ is outdated.
-    set (CMAKE_CXX_FLAGS "-std=c++0x -stdlib=libc++ ${CMAKE_CXX_FLAGS}")
-  elseif(NOT WIN32)
-    # CLang for Windows (at least CLang 8.0 distributed with VS 2019)
-    # does not support option "-std=c++0x"
-    set (CMAKE_CXX_FLAGS "-std=c++0x ${CMAKE_CXX_FLAGS}")
+    set (CMAKE_CXX_FLAGS "-stdlib=libc++ ${CMAKE_CXX_FLAGS}")
   endif()
   # Optimize size of binaries
   set (CMAKE_SHARED_LINKER_FLAGS "-Wl,-s ${CMAKE_SHARED_LINKER_FLAGS}")
@@ -148,14 +144,10 @@ elseif(MINGW)
   # workaround bugs in mingw with vtable export
   set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--export-all-symbols")
 
-  # Require C++11
-  set (CMAKE_CXX_FLAGS "-std=gnu++0x ${CMAKE_CXX_FLAGS}")
   # Optimize size of binaries
   set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")
   set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s")
 elseif (DEFINED CMAKE_COMPILER_IS_GNUCXX)
-  # Require C++11
-  set (CMAKE_CXX_FLAGS "-std=c++0x ${CMAKE_CXX_FLAGS}")
   # Optimize size of binaries
   set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")
   set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s")
diff --git a/adm/cmake/occt_macros.cmake b/adm/cmake/occt_macros.cmake
index 0a38794527..4a060665f6 100644
--- a/adm/cmake/occt_macros.cmake
+++ b/adm/cmake/occt_macros.cmake
@@ -80,9 +80,9 @@ macro (OCCT_MAKE_COMPILER_SHORT_NAME)
     set (COMPILER gcc)
   elseif (DEFINED CMAKE_COMPILER_IS_GNUCXX)
     set (COMPILER gxx)
-  elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  elseif (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
     set (COMPILER clang)
-  elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
+  elseif (CMAKE_CXX_COMPILER_ID MATCHES "[Ii][Nn][Tt][Ee][Ll]")
     set (COMPILER icc)
   else()
     set (COMPILER ${CMAKE_GENERATOR})
@@ -589,9 +589,7 @@ macro (OCCT_UPDATE_TARGET_FILE)
   endif()
 
   install (CODE
-  "cmake_policy(PUSH)
-  cmake_policy(SET CMP0007 NEW)
-  string (TOLOWER \"\${CMAKE_INSTALL_CONFIG_NAME}\" CMAKE_INSTALL_CONFIG_NAME_LOWERCASE)
+  "string (TOLOWER \"\${CMAKE_INSTALL_CONFIG_NAME}\" CMAKE_INSTALL_CONFIG_NAME_LOWERCASE)
   file (GLOB ALL_OCCT_TARGET_FILES \"${INSTALL_DIR}/${INSTALL_DIR_CMAKE}/OpenCASCADE*Targets-\${CMAKE_INSTALL_CONFIG_NAME_LOWERCASE}.cmake\")
   foreach(TARGET_FILENAME \${ALL_OCCT_TARGET_FILES})
     file (STRINGS \"\${TARGET_FILENAME}\" TARGET_FILE_CONTENT)
@@ -600,8 +598,7 @@ macro (OCCT_UPDATE_TARGET_FILE)
       string (REGEX REPLACE \"[\\\\]?[\\\$]{OCCT_INSTALL_BIN_LETTER}\" \"\${OCCT_INSTALL_BIN_LETTER}\" line \"\${line}\")
       file (APPEND \"\${TARGET_FILENAME}\" \"\${line}\\n\")
     endforeach()
-  endforeach()
-  cmake_policy(POP)")
+  endforeach()")
 endmacro()
 
 macro (OCCT_INSERT_CODE_FOR_TARGET)
@@ -615,17 +612,14 @@ macro (OCCT_INSERT_CODE_FOR_TARGET)
 endmacro()
 
 macro (OCCT_UPDATE_DRAW_DEFAULT_FILE)
-  install(CODE "cmake_policy(PUSH)
-  cmake_policy(SET CMP0007 NEW)
-  set (DRAW_DEFAULT_FILE_NAME \"${INSTALL_DIR}/${INSTALL_DIR_RESOURCE}/DrawResources/DrawPlugin\")
+  install(CODE "set (DRAW_DEFAULT_FILE_NAME \"${INSTALL_DIR}/${INSTALL_DIR_RESOURCE}/DrawResources/DrawPlugin\")
   file (STRINGS \"\${DRAW_DEFAULT_FILE_NAME}\" DRAW_DEFAULT_CONTENT)
   file (REMOVE \"\${DRAW_DEFAULT_FILE_NAME}\")
   foreach (line IN LISTS DRAW_DEFAULT_CONTENT)
     string (REGEX MATCH \": TK\([a-zA-Z]+\)$\" IS_TK_LINE \"\${line}\")
     string (REGEX REPLACE \": TK\([a-zA-Z]+\)$\" \": TK\${CMAKE_MATCH_1}${BUILD_SHARED_LIBRARY_NAME_POSTFIX}\" line \"\${line}\")
     file (APPEND \"\${DRAW_DEFAULT_FILE_NAME}\" \"\${line}\\n\")
-  endforeach()
-  cmake_policy(POP)")
+  endforeach()")
 endmacro()
 
 macro (OCCT_CREATE_SYMLINK_TO_FILE LIBRARY_NAME LINK_NAME)
diff --git a/adm/cmake/occt_toolkit.cmake b/adm/cmake/occt_toolkit.cmake
index 8cbb8106e5..4ed3d4a66f 100644
--- a/adm/cmake/occt_toolkit.cmake
+++ b/adm/cmake/occt_toolkit.cmake
@@ -339,10 +339,10 @@ foreach (USED_ITEM ${USED_EXTERNLIB_AND_TOOLKITS})
       else() # get CSF_ value
         set (CURRENT_CSF ${${USED_ITEM}})
         if (NOT "x${CURRENT_CSF}" STREQUAL "x")
-          if ("${CURRENT_CSF}" STREQUAL "CSF_OpenGlLibs")
+          if ("${CURRENT_CSF}" STREQUAL "${CSF_OpenGlLibs}")
             add_definitions (-DHAVE_OPENGL)
           endif()
-          if ("${CURRENT_CSF}" STREQUAL "CSF_OpenGlesLibs")
+          if ("${CURRENT_CSF}" STREQUAL "${CSF_OpenGlesLibs}")
             add_definitions (-DHAVE_GLES2)
           endif()
 
diff --git a/dox/build/build_occt/building_occt.md b/dox/build/build_occt/building_occt.md
index 2e1c7ec18a..8180c85cb9 100644
--- a/dox/build/build_occt/building_occt.md
+++ b/dox/build/build_occt/building_occt.md
@@ -17,7 +17,7 @@ On Linux and macOS we recommend to use libraries maintained by distributive deve
 @section build_occt_win_cmake Building with CMake tool
 
 This chapter describes the [CMake](https://cmake.org/download/)-based build process, which is now suggested as a standard way to produce the binaries of Open CASCADE Technology from sources.
-OCCT requires CMake version 2.8.12 or later.
+OCCT requires CMake version 3.1 or later.
 
 CMake is a tool that generates the actual project files for the selected target build system (e.g. Unix makefiles) or IDE (e.g. Visual Studio 2010).
 Here we describe the build procedure on the example of Windows platform with Visual Studio 2010.
@@ -113,6 +113,7 @@ The following table gives the full list of environment variables used at the con
 | BUILD_PATCH | Path | Points to the directory recognized as a "patch" for OCCT. If specified, the files from this directory take precedence over the corresponding native OCCT sources. This way you are able to introduce patches to Open CASCADE Technology not affecting the original source distribution |
 | BUILD_WITH_DEBUG | Boolean | Enables extended messages of many OCCT algorithms, usually printed to cout. These include messages on internal errors and special cases encountered, timing, etc. |
 | BUILD_ENABLE_FPE_SIGNAL_HANDLER | Boolean | Enable/Disable the floating point exceptions (FPE) during DRAW execution only. Corresponding environment variable (CSF_FPE) can be changed manually in custom.bat/sh scripts without regeneration by CMake. |
+| BUILD_CPP_STANDARD | String | Employ corresponding c++ standard (C++11, C++14, ..C++23) for building OCCT |
 | CMAKE_CONFIGURATION_TYPES | String | Semicolon-separated CMake configurations |
 | INSTALL_DIR          | Path | Points to the installation directory. *INSTALL_DIR* is a synonym of *CMAKE_INSTALL_PREFIX*. The user can specify both *INSTALL_DIR* or *CMAKE_INSTALL_PREFIX* |
 | INSTALL_DIR_BIN      | Path | Relative path to the binaries installation directory (absolute path is ${INSTALL_DIR}/${INSTALL_DIR_BIN}) |
diff --git a/dox/introduction/introduction.md b/dox/introduction/introduction.md
index 0e18f48aa8..edfc7e9412 100644
--- a/dox/introduction/introduction.md
+++ b/dox/introduction/introduction.md
@@ -359,7 +359,7 @@ https://dev.opencascade.org/resources/download/3rd-party-components
 
 | Component | Where to find | Used for | Purpose |
 | --------- | ------------- | -------- | -------------------- |
-| CMake 2.8+ | https://cmake.org/ | Configuration | Build from sources |
+| CMake 3.1+ | https://cmake.org/ | Configuration | Build from sources |
 | Intel TBB 4.x or later | https://oneapi-src.github.io/oneTBB/ | All | Parallelization of algorithms (alternative to built-in thread pool) |
 | OpenGL 3.3+, OpenGL ES 2.0+ | System | Visualization | Required for using 3D Viewer |
 | OpenVR 1.10+ | https://github.com/ValveSoftware/openvr | Visualization | VR (Virtual Reality) support in 3D Viewer |
diff --git a/samples/glfw/CMakeLists.txt b/samples/glfw/CMakeLists.txt
index d40add62ce..c647b13519 100644
--- a/samples/glfw/CMakeLists.txt
+++ b/samples/glfw/CMakeLists.txt
@@ -4,7 +4,6 @@ project(glfw-occt-demo)
 
 set (CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/adm/cmake" ${CMAKE_MODULE_PATH})
 
-set(CMAKE_CXX_STANDARD 11)
 set(APP_VERSION_MAJOR 1)
 set(APP_VERSION_MINOR 0)
 set(APP_TARGET glfwocct)
diff --git a/samples/glfw/adm/cmake/FindOpenCASCADE.cmake b/samples/glfw/adm/cmake/FindOpenCASCADE.cmake
index 0b5a9eeeba..f079c15425 100644
--- a/samples/glfw/adm/cmake/FindOpenCASCADE.cmake
+++ b/samples/glfw/adm/cmake/FindOpenCASCADE.cmake
@@ -39,9 +39,9 @@ elseif (DEFINED CMAKE_COMPILER_IS_GNUCC)
   set (MY_COMPILER gcc)
 elseif (DEFINED CMAKE_COMPILER_IS_GNUCXX)
   set (MY_COMPILER gcc)
-elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+elseif (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
   set (MY_COMPILER clang)
-elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
+elseif (CMAKE_CXX_COMPILER_ID MATCHES "[Ii][Nn][Tt][Ee][Ll]")
   set (MY_COMPILER icc)
 else()
   set (MY_COMPILER ${CMAKE_GENERATOR})
diff --git a/samples/java/jniviewer/app/src/main/jni/CMakeLists.txt b/samples/java/jniviewer/app/src/main/jni/CMakeLists.txt
index 59e131dfc0..e399de7601 100644
--- a/samples/java/jniviewer/app/src/main/jni/CMakeLists.txt
+++ b/samples/java/jniviewer/app/src/main/jni/CMakeLists.txt
@@ -37,7 +37,7 @@ list(APPEND aLibDeps lib_FreeType)
 # system libraries
 list(APPEND aLibDeps EGL GLESv2 log android)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -frtti -fexceptions -fpermissive")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -frtti -fexceptions -fpermissive")
 
 add_library(TKJniSample SHARED ${SOURCE_FILES})
 target_link_libraries(TKJniSample ${aLibDeps})
diff --git a/samples/mfc/standard/01_Geometry/CMakeLists.txt b/samples/mfc/standard/01_Geometry/CMakeLists.txt
index 62d612231f..0e4a25598e 100644
--- a/samples/mfc/standard/01_Geometry/CMakeLists.txt
+++ b/samples/mfc/standard/01_Geometry/CMakeLists.txt
@@ -1,4 +1,10 @@
-cmake_minimum_required (VERSION 2.6)
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 project (Geometry)
 
diff --git a/samples/mfc/standard/02_Modeling/CMakeLists.txt b/samples/mfc/standard/02_Modeling/CMakeLists.txt
index 6a690ba834..29b562d013 100644
--- a/samples/mfc/standard/02_Modeling/CMakeLists.txt
+++ b/samples/mfc/standard/02_Modeling/CMakeLists.txt
@@ -1,4 +1,10 @@
-cmake_minimum_required (VERSION 2.6)
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 project (Modeling)
 
diff --git a/samples/mfc/standard/03_ImportExport/CMakeLists.txt b/samples/mfc/standard/03_ImportExport/CMakeLists.txt
index 93f728e36c..c0e975516c 100644
--- a/samples/mfc/standard/03_ImportExport/CMakeLists.txt
+++ b/samples/mfc/standard/03_ImportExport/CMakeLists.txt
@@ -1,4 +1,10 @@
-cmake_minimum_required (VERSION 2.6)
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 project (ImportExport)
 
diff --git a/samples/mfc/standard/04_HLR/CMakeLists.txt b/samples/mfc/standard/04_HLR/CMakeLists.txt
index 68785a28cf..14c8cc3850 100644
--- a/samples/mfc/standard/04_HLR/CMakeLists.txt
+++ b/samples/mfc/standard/04_HLR/CMakeLists.txt
@@ -1,4 +1,10 @@
-cmake_minimum_required (VERSION 2.6)
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 project (HLR)
 
diff --git a/samples/mfc/standard/mfcsample/CMakeLists.txt b/samples/mfc/standard/mfcsample/CMakeLists.txt
index 8b759a89d8..55c6e49159 100644
--- a/samples/mfc/standard/mfcsample/CMakeLists.txt
+++ b/samples/mfc/standard/mfcsample/CMakeLists.txt
@@ -1,4 +1,10 @@
-cmake_minimum_required (VERSION 2.6)
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 project (mfcsample)
 
diff --git a/samples/webgl/CMakeLists.txt b/samples/webgl/CMakeLists.txt
index 5a2a323aa9..4991d154e4 100644
--- a/samples/webgl/CMakeLists.txt
+++ b/samples/webgl/CMakeLists.txt
@@ -2,7 +2,6 @@ cmake_minimum_required(VERSION 3.2)
 
 project(occt-webgl-sample)
 
-set(CMAKE_CXX_STANDARD 11)
 set(APP_VERSION_MAJOR 1)
 set(APP_VERSION_MINOR 0)
 set(APP_TARGET occt-webgl-sample)
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index f73a2d824b..beb934f720 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -1,4 +1,10 @@
-cmake_minimum_required (VERSION 2.8.12 FATAL_ERROR)
+# Caution! Be careful, when increase minimal cmake version:
+# using of newer version may leads (by default) to applying
+# of some new policies. It may break compilation.
+# For canceling of applying new policies use:
+# cmake_policy(PUSH) before `cmake_minimum_required`
+# and cmake_policy(POP) after.
+cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
 
 set (ADDITIONAL_INLCUDE_DIR_DESCR "Additional directory to be added in the projects include section")
 if (NOT DEFINED ADDITIONAL_INLCUDE_DIR)
diff --git a/tools/TInspectorEXE/CMakeLists.txt b/tools/TInspectorEXE/CMakeLists.txt
index 3aa2537e2f..2ebcc6e40a 100644
--- a/tools/TInspectorEXE/CMakeLists.txt
+++ b/tools/TInspectorEXE/CMakeLists.txt
@@ -5,3 +5,8 @@ set (EXECUTABLE_PROJECT ON)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 unset (EXECUTABLE_PROJECT)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKDFBrowser/CMakeLists.txt b/tools/TKDFBrowser/CMakeLists.txt
index 29b45e9843..a2a5445156 100644
--- a/tools/TKDFBrowser/CMakeLists.txt
+++ b/tools/TKDFBrowser/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKDFBrowser)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKMessageModel/CMakeLists.txt b/tools/TKMessageModel/CMakeLists.txt
index 911ffb1fbe..a6ef727d9e 100644
--- a/tools/TKMessageModel/CMakeLists.txt
+++ b/tools/TKMessageModel/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKMessageModel)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKMessageView/CMakeLists.txt b/tools/TKMessageView/CMakeLists.txt
index 9b3c1aaec7..ee948ecc72 100644
--- a/tools/TKMessageView/CMakeLists.txt
+++ b/tools/TKMessageView/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKMessageView)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKShapeView/CMakeLists.txt b/tools/TKShapeView/CMakeLists.txt
index 928a72f1e8..c4dd2e935b 100644
--- a/tools/TKShapeView/CMakeLists.txt
+++ b/tools/TKShapeView/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKShapeView)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKTInspector/CMakeLists.txt b/tools/TKTInspector/CMakeLists.txt
index 0a05b7ca15..23389b74cd 100644
--- a/tools/TKTInspector/CMakeLists.txt
+++ b/tools/TKTInspector/CMakeLists.txt
@@ -6,4 +6,9 @@ OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
+
 unset (INSTALL_API)
diff --git a/tools/TKTInspectorAPI/CMakeLists.txt b/tools/TKTInspectorAPI/CMakeLists.txt
index d2f21e0f9b..06b3798301 100644
--- a/tools/TKTInspectorAPI/CMakeLists.txt
+++ b/tools/TKTInspectorAPI/CMakeLists.txt
@@ -6,5 +6,9 @@ OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 
-UNSET (TOOL_API_LIBRARY)
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
 
+UNSET (TOOL_API_LIBRARY)
diff --git a/tools/TKToolsDraw/CMakeLists.txt b/tools/TKToolsDraw/CMakeLists.txt
index f57982cf05..d448d51881 100644
--- a/tools/TKToolsDraw/CMakeLists.txt
+++ b/tools/TKToolsDraw/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKToolsDraw)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKTreeModel/CMakeLists.txt b/tools/TKTreeModel/CMakeLists.txt
index 99fc025494..0b2d9c65eb 100644
--- a/tools/TKTreeModel/CMakeLists.txt
+++ b/tools/TKTreeModel/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKTreeModel)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKVInspector/CMakeLists.txt b/tools/TKVInspector/CMakeLists.txt
index 1a6de1456a..cbe9037f6d 100644
--- a/tools/TKVInspector/CMakeLists.txt
+++ b/tools/TKVInspector/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKVInspector)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
diff --git a/tools/TKView/CMakeLists.txt b/tools/TKView/CMakeLists.txt
index ed33343886..d630f5bbe3 100644
--- a/tools/TKView/CMakeLists.txt
+++ b/tools/TKView/CMakeLists.txt
@@ -3,3 +3,8 @@ project(TKView)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit)
 OCCT_INCLUDE_CMAKE_FILE (adm/cmake/occt_toolkit_prepare_tool)
+
+# This project depends from Qt.
+# Qt 5.11.2 is incompatible with c++20.
+# So, it should be compiled with c++11/c++14 language standard.
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)