This repository is for cross-building prerequired packages. It can be used to build packages for a new Haiku architecture as well as for building packages for a incompatible Haiku version of the same architecture as the host. In order to be able to build anything, you need a haiku_cross_devel package that matches the target architecture you'd like to build packages for. You can build that via Haiku's build system like this: jam -q haiku_cross_devel.hpkg