--- libphonenumber-8.13.5/tools/cpp/CMakeLists.txt.orig	2023-02-01 14:53:18.841253443 +0100
+++ libphonenumber-8.13.5/tools/cpp/CMakeLists.txt	2023-02-01 14:53:59.415031644 +0100
@@ -18,7 +18,7 @@
 
 # Pick the C++ standard to compile with.
 # Abseil currently supports C++11, C++14, and C++17.
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard used to compile this project")
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 project (generate_geocoding_data)