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This error is most likely caused by incompatibility in C++ libraries and the compiler. Don't be surprised if you fix this error more errors will pop up in the compilation process.

If you want to run ROS Noetic with RPi 4, the best recommended way is to use Ubuntu 20.04: https://ubuntu.com/download/raspberry-pi. The installation is straightforward and you will more resources for support.

If you want to continue troubleshooting for this error, I suggest to look of what may cause: error: 'once_flag' in namespace 'std' does not name a type

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