diff -urNp -x '*.orig' percona-server-5.7.31-34.org/cmake/build_configurations/compiler_options.cmake percona-server-5.7.31-34/cmake/build_configurations/compiler_options.cmake
--- percona-server-5.7.31-34.org/cmake/build_configurations/compiler_options.cmake	2020-08-15 11:23:18.000000000 +0200
+++ percona-server-5.7.31-34/cmake/build_configurations/compiler_options.cmake	2021-05-26 15:13:06.336651991 +0200
@@ -32,17 +32,17 @@ IF(SIZEOF_VOIDP EQUAL 8)
   SET(64BIT 1)
 ENDIF()
 
-SET(CMAKE_CXX_STANDARD 98)
+SET(CMAKE_CXX_STANDARD 11)
  
 # Compiler options
 IF(UNIX)  
-  MY_CHECK_CXX_COMPILER_FLAG("-std=gnu++03" GNU03_SUPPORTED)
+  MY_CHECK_CXX_COMPILER_FLAG("-std=gnu++11" GNU11_SUPPORTED)
 
-  IF(GNU03_SUPPORTED)
+  IF(GNU11_SUPPORTED)
     IF(CMAKE_VERSION VERSION_LESS 3.1.0)
-      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++03")
+      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
     ELSE()
-      SET(CMAKE_CXX98_EXTENSION_COMPILE_OPTION -std=gnu++03)
+      SET(CMAKE_CXX11_EXTENSION_COMPILE_OPTION -std=gnu++11)
     ENDIF()
   ENDIF()