--- ./Modules/Compiler/IBMClang-CXX.cmake_orig	2023-09-29 07:59:24.918923353 +0000
+++ ./Modules/Compiler/IBMClang-CXX.cmake	2023-09-29 07:59:59.058452582 +0000
@@ -31,6 +31,8 @@
   set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
   set(CMAKE_CXX20_STANDARD_COMPILE_OPTION  "-std=c++20")
   set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++20")
+  set(CMAKE_CXX23_STANDARD_COMPILE_OPTION  "-std=c++2b")
+  set(CMAKE_CXX23_EXTENSION_COMPILE_OPTION "-std=gnu++2b")
 endif()
 
 __compiler_check_default_language_standard(CXX 17.1.0 17)