I am using qt 6.5.0 as a third party library. The project was building fine until I was using qt5 , on trying to build with qt6.5.0, I get the following error:

“Qt requires a C++17 compiler, and a suitable value for __cplusplus. On MSVC, you must pass the /Zc:__cplusplus option to the compiler.”

I do know that one of the solution is setting the compile options in visual studio under c/c++ property page however since my project is build by make file I do not see c/c++ compiler option in property page.

so in this, can anyone help with any suggestion as to how to fix this…