https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100293
--- Comment #6 from Brecht Sanders <brechtsanders at users dot sourceforge.net> --- Yes, that folder exists and that's where my TMP and TEMP environment variables point to. I also tried to point them to a folder on the C: drive, as R: is a RAM drive and I wanted to exclude that that was the issue, but the result was the same: build fails in the same place when configuring libatomic.