ctags常见错误的解决办法

ctags -R *
系统报错：

ctags: skipping arpa: it is not a regular file.
ctags: skipping asm: it is not a regular file.
ctags: skipping asm-generic: it is not a regular file.
ctags: skipping bits: it is not a regular file.
ctags: skipping blkid: it is not a regular file.
ctags: skipping boost: it is not a regular file. 

说明是目录无法识别造成的，通过安装如下程序才可以。
sudo apt-get install exuberant-ctags

重新ctags -R *
运行成功，无任何报错。