Libetonyek build failure with Boost >=1.81

[Leo Famulari]

Julien Nabet wrote:
> Could you provide the autogen.input you use?
> 
> I'm on Debian testing which uses Boost 1.83 but when checking 
> config.log, I see:
> 
> configure:33360: checking which boost to use
> configure:34711: result: internal
> 
> and internal Boost used is 1.85 version.

Where can I find the file 'autogen.input'? It doesn't appear in my copy
of the LibreOffice 7.6.7.2 source code, not even after I try to build
it.