Whither stoneage?

[Bob Snyder]

I recently built 4.10 from source and find that there are fewer window 
manager themes available as 'built-in'. My favorite, stoneage, has 
disappeared. I downloaded a package of themes which restored most of the 
old themes, but not stoneage. I'm guessing this is because it was still 
'built-in' with 4.8.

So I copied xfwm 4.8's themes/stoneage folder into my  xfwm 4.10 tree 
and rebuilt it, but it's still missing from the list. Is there something 
else I need to do? Maybe there's a better approach?

Thanks,

Bob S.