Lopper is a backend Python utility used by AMD Vitis™ to extract hardware metadata from the system device tree. Although included in the Vitis installation, Lopper is also available on GitHub. Vitis provides an environment variable to enable the use of an external Lopper without modifying the Vitis installation. To use an external version of Lopper, run the following command:
export VITIS_LOPPER_INSTALL_LOC="path/to/Lopper"