问题描述

安装cartographer_ros
运行catkin_make_isolated --install --use-ninja

ubuntu版本：20.04
ros版本：noetic

命令出现一下问题

CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  Could NOT find PythonInterp: Found unsuitable version "2.7.18", but
  required is at least "3" (found /usr/bin/python)
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:391 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-3.16/Modules/FindPythonInterp.cmake:169 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  /opt/ros/noetic/share/catkin/cmake/python.cmake:4 (find_package)
  /opt/ros/noetic/share/catkin/cmake/all.cmake:164 (include)
  /opt/ros/noetic/share/catkin/cmake/catkinConfig.cmake:20 (include)
  CMakeLists.txt:54 (find_package)

解决方案：

打开/catkin_ws/build_isolated/cartographer_ros下的CMakeCache.txt
勾选Advanced找到PYTHON_EXECUTABLE,更新为同路径下的Python3解决