Build-tool helps maintaining development environments if complex dependencies have to be met. It makes it possible to run the builds in a reproducable way.
A build is described by a recipe. A recipe is the collection of everything needed to perform a build. It controls every aspect of the build by separating the users environment from the actual build environment as much as possible.
The tool brings a collection of recipes. They are mainly kde related because that is what i use the script for. But it could easily compile the xorg modules or gnome or the linux kernel if someone wrote the recipe.
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