Yes, I got it to build by changing the version number and a bunch of other things, but they changed the way that gnuradio 3.8.1.0 interacts with its python modules and the gnuradio-companion could not find the lime modules written using the old xml format. I down loaded the source (uBuntu 20.04) for gr-limesdr, when it started having problems, I looked and it does not seem to have the LimeRFE stuff in it anyway - so I gave up on the build. There is some discussion in another thread - may be they know what is going on and can point to a working version -
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