Yes. I've been compiling my own versions of 32-bit MAME/MAMEUI and 64-bit MAME/MAMEUI for years, including when they started using the new toolset late last year/early this year.
I did get the 32-bit MAME to compile this time, maybe it was a case of forgetting to clean when entering commands manually.
Though, the UI compiles still failed. I wasn't able to get them compiled for 0.178, either.