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I'm building a few packages from source and wondering what the correct --build=? is for Debian (or Ubuntu), if any?

When I run config.guess manually, the return value is x86_64-unknown-linux-gnu. The same is returned when omitting --build during any ./configure I've tried.

When I specify --build=x86_64-linux-gnu (which I found by snooping around Debian's PHP build source), my compiler is showing x86_64-pc-linux-gnu on the screen as it compiles.

I see a few directories named x86_64-linux-gnu on my system:

/lib/x86_64-linux-gnu
/usr/include/x86_64-linux-gnu
/usr/lib/gcc/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu
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