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Two versions are built, one for the AMD Ryzen based Wombat hardware device and the other intended to run under a Hyper-V hypervisor.
The primary source of information about building and installing Alto-OS is in the readme file in the source repository: https://bitbucket.org/navtechradar/alto/src/main/
To speed up the building of the main Alto-OS images, the toolchain is built from source first. This is then copied into the Alto-OS build tree and used to compile the OS packages and Kernel.