nealrichardson commented on pull request #8468:
URL: https://github.com/apache/arrow/pull/8468#issuecomment-807541121


   Haven't seen that before, and we've been building with re2 for months now. 
Maybe this is the first time we're building something that actually uses re2? 
It's possible that re2 needs a "backport" library built with the rtools3.5 
toolchain; an immediate workaround could be to build with 
`-DRE2_SOURCE=BUNDLED` here, or to make `ARROW_WITH_RE2` conditional on the 
toolchain (like we do for `ARROW_S3` already). Given that we won't have to 
support the rtools3.5 toolchain after April or May, I'll try just turning it 
off here.


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