ROS编译(catkin_make):Unable to find either executable ‘empy‘ or Python module ‘em‘ 错误解决

CMake Error at /opt/ros/noetic/share/catkin/cmake/empy.cmake:30 (message):
  Unable to find either executable 'empy' or Python module 'em'...  try
  installing the package 'python3-empy'

使用下面指令:

catkin_make -DPYTHON_EXECUTABLE=/usr/bin/python3

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