From OpenOffice.org Wiki

Build System Requirements

Building OpenOffice.org is regularly supported on these major platforms:

• Linux System Requirements

• Windows System Requirements

• Solaris System Requirements

• Mac OS X System Requirements

There are also Software requirements which are needed on every platform.

If you need support for platform which may not supported with every version of OpenOffice.org, please ask for most recent Information at Porting mailing list. Platform which may are supported and work out of the box are:

• OS/2

• FreeBSD

• Windows with mingw Compiler and Tools chain

Platforms with outdated or no support at all are currently:

• Irix

• Darwin

• AIX

• BeOS

• AmigaOS

and some other systems. If interested in helping in such port please also ask for help at the Porting mailing list at Porting Project.