lix/doc/manual/rl-next/build-dir.md

synopsis	cls	prs	credits	category
Add a `build-dir` setting to set the backing directory for builds	1514	gh#10303 gh#10312 gh#10883	roberth tomberek	Improvements

build-dir can now be set in the Nix configuration to choose the backing directory for the build sandbox. This can be useful on systems with /tmp on tmpfs, or simply to relocate large builds to another disk.

Also, XDG_RUNTIME_DIR is no longer considered when selecting the default temporary directory, as it's not intended to be used for large amounts of data.