Recursive make speedup patch

[Sergey Matveychuk]

Kris Kennaway wrote:

>>>* 'make index' and 'make describe' use some perl code, which might be
>>>optimized or rewritten (e.g. replaced by an awk script, which would
>>>have the further benefit of working out of the box on 5.x).
>>
>>I was planning on redoing some of the Perl per my email to you on that
>>old PR.  However, I can look at an awk rewrite as well.
> 
> 
> I had a look at NetBSD: they use an awk script, but INDEX generation
> seems to work a bit differently than us.  Still, it might be useful as
> a comparison in case they've spotted some useful tricks.

I've tried rewrite perl code of 'describe' on awk, but I couldn't. I've 
tried sed/awk combination and got about two time slowing down. :(

But I don't awk-guru anyway.

-- 
Sem.