Probably, it means systemd-devel. A patch is coming.
Created attachment 394792 [details] Patch
The same is probably needed for WPE. Can you add it in the same patch? Thanks!
Created attachment 394801 [details] Patch
Comment on attachment 394801 [details] Patch Thanks!
Committed r259155: <https://trac.webkit.org/changeset/259155> All reviewed patches have been landed. Closing bug and clearing flags on attachment 394801 [details].