Generic project - there is no way to define c++11

I've try to open a project related to ROS system with QtCreator

Since ROS uses a custom build tool the only way is to use generic project. So, after some difficulties I successfully opened and build my project. But I can't edit the source since clang doesn't accept the source and fill up all the code with errors and warnings. As I see the main problem is C+11 support. After long long searching in Internet I've found a way to configure c+11 support by adding the line #define __cplusplus 201103L to the .config file. But the problem persists and clang gives me errors like this:

I see no way to avoid this problem.