- workaround for https://github.com/Boolector/boolector/issues/226

--- CMakeLists.txt.orig	2024-06-06 01:55:51 UTC
+++ CMakeLists.txt
@@ -196,7 +196,7 @@ add_required_c_flag("-std=gnu99")
 #       btorconfig.h and they are else not yet added to CMAKE_C(XX)_FLAGS at
 #       file generation time (configure_file).
 add_required_c_flag("-std=gnu99")
-add_required_cxx_flag("-std=gnu++11")
+add_required_cxx_flag("-std=gnu++14")
 
 add_check_c_cxx_flag("-W")
 add_check_c_cxx_flag("-Wall")