YouTube Center are using a combination of ant (java) and python to build YouTube Center.

The build system is made in ant and require ant and java to be installed.

• ant all -- Builds everything below except for the styles.
• ant firefox -- Builds Firefox extension (.xpi)
• ant xul -- Builds the Firefox beta extension (.xpi)
• ant chrome -- Builds Chrome extension (.crx)
• ant maxthon -- Builds Maxthon extension (.mxaddon)
• ant opera -- Builds Opera extension (.oex)
• ant userscript -- Builds userscript (.user.js)
• ant safari -- Makes everything ready for Safari to finish building YouTube Center.
• ant styles -- Rebuilds all the styles.