libextractor fails to build on Snow Leopard

[Richard L. Hamilton]

First actual build error seems to be:

:info:build html_extractor.c:30:24: error: tidybuffio.h: No such file or directory

What should supply it?  Is it a dependency not automatically retrieved, or built on the fly, or what?

I do see an OS file: /usr/include/tidy/buffio.h

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