EXT MVC is a complete MVC stack on top of Ext JS (extjs.com).
You are advised to use the base app to get up and running with Ext MVC as it sets everything up for you.
If you're comfortable with git:
git clone git://github.com/extmvc/baseapp.git myapp
rm -rf .git/
Download the latest zip file from Github at github.com/extmvc/baseapp/zipball/master and unzip.
Read the readme file inside the base app and refer to extmvc.com
Ext MVC comes with a set of build tools for itself and your applications, written in Ruby. You need to be using the Baseapp or a structure similar to it for these to work effectively.
Building your Ext MVC application
Build any app started from the base app by running this from the app's root directory:
ruby script/build all
Building your app also concatenates any CSS includes in index.html into public/application-all.css.
NOTE: Building looks at your index.html, NOT public/index.html. index.html is your development version, public/index.html should simply include those concatenated/minified files.
If you need your app to be built every time you change any of the source files for whatever reason, use:
ruby script/build auto
This will again look at index.html and will force a rebuild any time any of those files are changed.
Other app build options
There are several other build commands, most of which are used by the two above:
ruby script/build css - only build CSS files, no JS concatenation or minification
ruby script/build js - only builds JS files, not CSS
ruby script/build concatenate_js - concatenates but does not attempt to minify your JS
ruby script/build minify_js - minifies an already concatenated public/application-all.js file
Building Ext MVC
If you are changing Ext MVC files and need to build Ext MVC itself, use:
ruby script/build mvc
ruby script/build mvc_auto
Again run from the app root directory. Like with ruby script/build auto, mvc_auto automatically rebuilds whenever any Ext MVC file is changed.