Created attachment 636224 [details] Build log Now with bug 663468 fixed, x11-themes/arc-theme should be possible without USE=pre-rendered. However, x11-themes/arc-theme does not build with the flag off since --export-png is an unknown option. Build log attached.
The build log is for =x11-themes/arc-theme-20190917. However the same is true of =x11-themes/arc-theme-20190330.
*** This bug has been marked as a duplicate of bug 700524 ***