安装完libwebp之后，执行dwebp或者cwebp命令报 dwebp: error while loading shared libraries: libwebpdemux.so.2: cannot open shared object file: No such file or directory 错误的解决办法：
添加环境变量：
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib echo $LD_LIBRARY_PATH echo "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib" >> ~/.bashrc
