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Parallel ./configure
I'm sorry, but in the year 2025, this is ridiculous: $ time ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether sleep supports fractional seconds...
This is written in an inherently sequential way, but in principle many of these tests could be run in parallel. I put together a simple proof-of-concept GitHub repository that contains the full version of all these files if you want to copy-paste. The demo app prints file creation times, if it can figure out how to on your platform.
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