Created attachment 856860 [details] error of the bug The fix was to create a systemd file in package.use and add lzma to use flag.
Created attachment 856863 [details] error of the bug
Your build log shows "-Ddefault-compression=xz" being passed to meson setup. The ebuild does not set this. I suspect you have set it in MYMESONARGS.
I've gone ahead and updated the wiki page to mention the need for USE=lzma more explicitly.