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Hardware: Any 64-bit capable Intel Mac

RAM: 4GB, 2GB min
HD: 3GB free space
How to tell if your Mac is 64-bit capable
- http://support.apple.com/kb/ht3696
- sysctl hw |grep 64bit

OS: Mac OS X 10.6.7

How to tell what version of Mac OS X you are running
- Apple Menu () -> "About this Mac..."
- sw_vers
Where to get it
- http://store.apple.com for Mac OS X 10.6 OS installer
- run Software Update to get to at least 10.6.7
  - Apple Menu () -> "Software Update..."

Xcode: 3.2.6 or later

Required for
- Compiling the code (3.2.x)
- Compiler flag fixes which correctly aligns the stack between function calls in 32-bit processes (3.2.6+)
Where to get it
- http://developer.apple.com (Mac Dev Center section)

If you install Xcode 4, you will have to re-install "Java for Mac OS X Update 4" or a later developer preview to correct headers in the JavaRuntimeSupport framework.

Java: "Java for Mac OS X 10.6 Update 4" or "Java for Mac OS X 10.6 Update 4 Developer Package"

Required for new API added for OpenJDK
Where to get it
- Apple Menu () -> "Software Update..." or http://connect.apple.com (Java section)
Any later developer preview of Java for Mac OS X 10M34xx is also sufficient.

Mercurial

Required to get source
Where to get it
- http://mercurial.berkwood.com/

Jtreg

Required only to run regression tests
Where to get it
- http://openjdk.java.net/jtreg/