This was caused by the switch to Flatpak dependencies, which now sandboxes the environment. These variables need to be white-listed.
Created attachment 394367 [details] Patch
Comment on attachment 394367 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=394367&action=review > Tools/ChangeLog:6 > + Make sure *_PROCESS_CMD_PREFIX variables are whitelisted in the Flatpak sandbox. An alternative could have been to add this to `env_var_suffixes_to_keep` but I'm also OK with this approach. Explicit is better than implicit usually :)
Comment on attachment 394367 [details] Patch I agree with explicit being better (though maybe I'll disagree when this comes back and bites us again ;)) so leaving as is. It would be good if these variables had 'WEBKIT' somewhere in them I think, if we were going to whitelist the suffix.
Yeah, or a WEBKIT_ prefix :)
Committed r258910: <https://trac.webkit.org/changeset/258910> All reviewed patches have been landed. Closing bug and clearing flags on attachment 394367 [details].
<rdar://problem/60826356>