Those builds are not official and are not supported. They're expected to break to some extent and are supposed to be limited to a few limited groups of people-- those who are sending technical bug reports in, and those who are willing to go bleeding edge without complaining when they end up with shrapnel in their thigh from it exploding.
I believe they've made it clear in the past that official U builds won't be provided.
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Re: MAME "u" download link suggestion
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