I always cannot find the way to install libxml-ruby gem which is used by Rails, so here's a command:
gem i libxml-ruby -- --with-xml2-dir=`brew ...
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This assumes you've installed libxml using homebrew.
I've encountered this and many other tips while googling around today. I've tried to compile them into a logical order of some things to try: Installing/debugging libxml on mac for ruby/rails.
Personally I found I didn't need the homebrew libxml. Some version compatibility there which meant building against my older system libxml worked better. But over the years there seems to be a lot different problems and a lot of "This simple fix worked for me" solutions put out there.
Neat!