ROS BUG: 使用pcl::visualization::CloudViewer时出现libpng errors

错误类型：

anaconda3/lib/libpng16.so.16: undefined reference to `inflateValidate@ZLIB_1.2.9’

解决办法：

1. wget https://ncu.dl.sourceforge.net/project/libpng/libpng16/1.6.32/libpng-1.6.32.tar.xz

2. cd libpng-1.6.32

3. ./configure

4. make check

5. sudo make install

6. sudo ldconfig

7. 在CmakeLists.txt中加入 target_link_libraries(conditional_filters /usr/local/lib/libpng16.so.16) 即可。