The downlevel installer doesn't work right now because it is trying to install a logging preference plist to /System/Library/Preferences (see bug 243699). To fix this, we should avoid emitting this plist when building for a downlevel installer by checking for the presence of WK_ALTERNATE_FRAMEWORKS_DIR.
rdar://99344600
Pull request: https://github.com/WebKit/WebKit/pull/3823
Committed 254004@main (226a0d2f0798): <https://commits.webkit.org/254004@main> Reviewed commits have been landed. Closing PR #3823 and removing active labels.