Although originally built on the x86 architecture, Gentoo has been ported to many others. Currently it is officially supported and considered stable on x86, x86-64, IA-64, PA-RISC, PowerPC, PowerPC 970, SPARC 64-bit and DEC Alpha architectures. It is also officially supported but considered in development state on MIPS, PS3 Cell Processor, System Z/s390, ARM, and SuperH. Official support for 32-bit SPARC hardware has been dropped.
Portability toward other operating systems, such as BSD-derived ones including Mac OS X, is under active development by the Gentoo/Alt project. The Gentoo/FreeBSD project already has a working guide based on FreeSBIE, while Gentoo/NetBSD, Gentoo/OpenBSD and Gentoo/DragonFly are being developed. There is also a project to get Portage working on OpenSolaris. There was an unofficial project to create a Gentoo port to GNU Hurd, but it has been inactive since 2006.
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