Sabayon Linux (64-bit) uses the Entropy system for package management. This system provides binary packages created from the Gentoo Linux unstable tree, compiled using the Portage system, with the result packaged into tarball packages. Entropy clients then pull these tarballs and perform the various post or pre compilation calls of the build to set up package correctly. This means the system is 100% binary compatible with a Gentoo system using the same build configuration. Sabayon uses the same core components as Gentoo, including OpenRC and baselayout2. All of Gentoo's configuration tools, such as etc-update and eselect are fully functional. In addition, Sabayon includes many of its own configuration tools for automatic configuration of various system components such as OpenGL.