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• An Intel Mac
• RAM: 1GB
• OS: Mac OS X 10.6.7 or later
• Java: "Java for Mac OS X 10.6 Update 4" or later

TL;DR

• Download an unofficial build

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• Open /Applications/Utilities/Java Preferences.app
• Drag both "OpenJDK 7" entries to the top of the list
• Run "java -version" in Terminal.app

Prerequisites to build

• Hardware: Any 64-bit capable Intel Mac
  • RAM: 4GB, 2GB min
• OS: Mac OS X 10.6, run Software Update to get to at least 10.6.7
• Xcode: 3.2.6 or later from http://developer.apple.com (Mac Dev Center section)
• Java: "Java for Mac OS X 10.6 Update 4" or later from http://connect.apple.com (Java section)
• Mercurial: http://mercurial.berkwood.com/
• Jtreg: http://openjdk.java.net/jtreg/

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