--- CMakeLists.txt.orig	2025-02-04 18:29:30 UTC
+++ CMakeLists.txt
@@ -147,7 +147,7 @@ if (NLOPT_CXX OR NLOPT_PYTHON OR NLOPT_GUILE OR NLOPT_
 if (NLOPT_CXX OR NLOPT_PYTHON OR NLOPT_GUILE OR NLOPT_OCTAVE OR NLOPT_JAVA)
   check_cxx_symbol_exists (__cplusplus ciso646 SYSTEM_HAS_CXX)
   if (SYSTEM_HAS_CXX)
-    set (CMAKE_CXX_STANDARD 11) # set the standard to C++11 but do not require it
+    set (CMAKE_CXX_STANDARD 17) # set the standard to C++17 but do not require it
 
     if (NLOPT_CXX)
       set (CMAKE_CXX_STANDARD_REQUIRED ON) # if we build C++ API, we do need C++11