Where is the executing?

I try executing ctags in M-x compile, it work.

emacs 24.5.1
ctags 5.8


------------------ 原始邮件 ------------------
发件人: "Roopa Mukherjee";<roopamukherjee@gmail.com>;
发送时间: 2015年12月9日(星期三) 下午3:37
收件人: "22132"<22132@debbugs.gnu.org>;
主题: bug#22132: ctags problem

Hi team,

I am getting following error when I execute "ctags -R":-


mukherjee17@sc-003[/opt/soe/projects/sr_4k_10_1_x/mukherjee17/sr1] >ctags -R

/opt/tools/unsupported/bin/ctags: no input files specified.
        Try `/opt/tools/unsupported/bin/ctags --help' for a complete list of options.

mukherjee17@sc-003[/opt/soe/projects/sr_4k_10_1_x/mukherjee17/sr1] >


Request you to please guide me to resolve this.

Regards,
Roopa Mukherjee