Installing dom0 updates from source

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For the newest security updates mention in  https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-049-2019.txt how can I install the security updates from security-testing repo but from source code? I prefer to compile or install everything from source code. I do not trust pre-baked binaries. I know, microcode is binary. But Intel is horrible so there is no way to escape closed source binary. But there is probably a higher security risk from not having latest microcode than that of the microcode itself being dangerous right? It is not known if microcode contains backdoors but it is known that the security vulnerabilities from lack of microcode is as dangerous as a backdoor.

But to my question how can I install latest dom0 updates from source?

Thank you

Granny

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