How to install MIT Scheme on Mac?

I want to install MIT Scheme on my Mac, I have downloaded the MacOS X binary(x86-64).

However, I could not make it work using Mac Terminal.

I have tried to follow these articles:

Installing MIT/GNU Scheme on Mac OS X Leopard

Installing MIT Scheme on Mac OS X

but it seems out of date and does not work.

So, I'm looking for a simple method which allows me to write Scheme code using Mac Terminal.

I have struggled for hours to try to install it.

UPDATED FOR EL CAPITAN:

The best way that I've found was from here:

1. Download either the 32-bit or 64-bit dmg file for Scheme.
2. Double click the .dmg file, and you'll get this window, in which you should drag the "MIT/GNU Scheme" file into the Applications folder.

3. For the 32-bit version, run this command:

   sudo ln -s /Applications/MIT\:GNU\ Scheme.app/Contents/Resources /usr/local/lib/mit-scheme-i386
   

   Then enter your administrator password, and run this command:

   sudo ln -s /usr/local/lib/mit-scheme-i386/mit-scheme /usr/local/bin/scheme
   

   For the 64-bit version, first run this command:

   sudo ln -s /Applications/MIT\:GNU\ Scheme.app/Contents/Resources /usr/local/lib/mit-scheme-x86-64
   

   Then enter your administrator password and run this command:

   sudo ln -s /usr/local/lib/mit-scheme-x86-64/mit-scheme /usr/local/bin/scheme
   

And that's it! Now you should be able to use MIT Scheme in your terminal by typing "scheme" into the command line:

Homebrew makes it easy for you. On Terminal, type:

ruby <(curl -fsSkL raw.github.com/mxcl/homebrew/go) ; brew install mit-scheme

Done!

Edit

The install script has been moved:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" ; brew install mit-scheme

For Yosemite 10.10.3:

After installing X11.app and homebrew,

$ brew tap homebrew/x11
$ brew install mit-scheme

I found it easier when a maintained package manager such as homebrew covers all the dependency and build stuff.

Edit: simply

$ brew install mit-scheme

would do. X11 is now optional instead of dependence. There is still an --with-x11 option which requires whole Xcode.