PX4设置环境变量后，roslaunch启动报错

 在配置用户环境bashrc后，启动roslaunch有几率报错，会出现launch XXX无法找到的问题，解决方法如下

source Tools/setup_gazebo.bash $(pwd) $(pwd)/build/px4_sitl_default

export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$(pwd):$(pwd)/Tools/sitl_gazebo

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