This env var is more clear in its purpose. WKDEV_SDK was used by another script but was never an ideal choice.
Pull request: https://github.com/WebKit/WebKit/pull/15748
Committed 265955@main (c66b20b0eff6): <https://commits.webkit.org/265955@main> Reviewed commits have been landed. Closing PR #15748 and removing active labels.