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for details Autobuild imports, configures, builds and installs
various kinds of software packages. It can be used in software
development to make sure that nothing is broken in the build
process of a set of packages, or can be used as an automated
installation tool. Autobuild config files are Ruby scripts which
configure rake to imports the package from a SCM or (optionnaly)
updates it configures it. This phase can handle code generation,
configuration (for instance for autotools-based packages), … It
takes the dependencies between packages into account in its
build process, updates the needed environment variables