Latest git pull fails to build (reconfiguring needed) about inn HOT 6 CLOSED

Perfect. That fixes both issues, Thank you.

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Neither I read during an update. It's already bootstrapped and I'm not hacking anything.

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It is a Perl header file.
I recommend to reconfigure INN after updating your operating system as locations and libraries may have changed (is it still Perl 5.36?).

make maintclean
./autogen
./configure with your flags (found at the beginning of config.log **before** running make maintclean)
make
make tests
make update

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And naturally the last command (make update) is run as root so that the permissions and ownerships are correctly set.

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This procedure should probably be documented in INSTALL or even better, a separate UPDATING file, maybe?

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It is said in the BOOTSTRAP file you see at the root of the Git checkout.
And also in HACKING.

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