MacBook:hangge_2227 hangge$ rvm install 2.4.1

Warning, new version of rvm available '1.29.4', you are using older version '1.29.3'.

You can disable this warning with:    echo rvm_autoupdate_flag=0 >> ~/.rvmrc

You can enable  auto-update  with:    echo rvm_autoupdate_flag=2 >> ~/.rvmrc

Searching for binary rubies, this might take some time.

No binary rubies available for: osx/10.13/x86_64/ruby-2.4.1.

Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.

Checking requirements for osx.

Installing requirements for osx.

Updating system...........-

Xcode version older than 4.6.2 installed, download and install newer version from:

    http://connect.apple.com

After installation open Xcode, go to Downloads and install Command Line Tools.

.

Error running 'requirements_osx_brew_update_system ruby-2.4.1',

please read /Users/hangge/.rvm/log/1543467646_ruby-2.4.1/update_system.log

Requirements installation failed with status: 1.