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折腾了一中午，尝试了各种修改路径的方法，仍然是提示报错，但是路径明明是添加进去了…
source /opt/ros/kinetic/setup.bash
export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:/home/bruce/study/slam/orb/point_map/Examples/ROS
bruce@bruce-desktop:~$ source ~/.bashrc
bruce@bruce-desktop:~$ echo $ROS_PACKAGE_PATH
/opt/ros/kinetic/share:/home/bruce/study/slam/orb/point_map/Examples/ROS
输出信息都是对的，但是依然报错…，头大了很久。
报错信息：
[rosbuild] Building package ORB_SLAM2
[rosbuild] Error from directory check: /opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py /opt/ros/kinetic/share/ORB_SLAM2 /home/bruce/study/slam/orb/point_map2/Examples/ROS/ORB_SLAM2
1
Traceback (most recent call last):
File "/opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py", line 48, in <module>
raise Exception
Exception
CMake Error at /opt/ros/kinetic/share/ros/core/rosbuild/private.cmake:102 (message):
[rosbuild] rospack found package "ORB_SLAM2" at
"/opt/ros/kinetic/share/ORB_SLAM2", but the current directory is
"/home/bruce/study/slam/orb/point_map2/Examples/ROS/ORB_SLAM2". You should
double-check your ROS_PACKAGE_PATH to ensure that packages are found in the
correct precedence order.
Call Stack (most recent call first):
/opt/ros/kinetic/share/ros/core/rosbuild/public.cmake:177 (_rosbuild_check_package_location)
CMakeLists.txt:4 (rosbuild_init)
-- Configuring incomplete, errors occurred!
See also "/home/bruce/study/slam/orb/point_map2/Examples/ROS/ORB_SLAM2/build/CMakeFiles/CMakeOutput.log".
make: *** 没有指明目标并且找不到 makefile。 停止。
原因分析及解决办法：
这是由于在ROS环境下编译使用了多个版本的ORB-SLAM2工程造成的，比如我运行了原版的ORB-SLAM2，然后拷贝了一份改了下文件名字，添加稠密重建模块，再对新的工程编译，就报了这个错误。因为原工程已经在/opt/ros/kinetic/share文件夹下建立了一个软连接ORB_SLAM2，这里包含有原工程的一些信息，我们需要做的就是把该软连接，替换为现在工程的软连接。
(1)先cd到/opt/ros/kinetic/share目录下，删除原来的ORB_SLAM2软连接
sudo rm -r ORB-SLAM2
(2)对当前工程在/opt/ros/kinetic/share目录下建立软连接
sudo ln -s /home/bruce/study/slam/orb/point_map/Examples/ROS/ORB_SLAM2 /opt/ros/kinetic/share/ORB_SLAM2
这样就圆满解决问题了！！！