--- mosh-1.4.0/configure.ac	2022-10-27 05:29:47.000000000 +0200
+++ mosh-1.4.0.new/configure.ac	2023-08-30 17:47:46.237136504 +0200
@@ -24,7 +24,7 @@
 
 # Protobuf 3.6+ requires C++11.
 AS_IF([pkg-config --atleast-version 3.6.0 protobuf],
-  [AX_CXX_COMPILE_STDCXX([11])])
+  [AX_CXX_COMPILE_STDCXX([17])])
 
 WARNING_CXXFLAGS=""
 PICKY_CXXFLAGS=""