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document updated 6 months ago, on May 31, 2022

Things like perlbrew are nice — they easily install many different versions of Perl.

Unfortunately, if you try to install a version of Perl older than 5.6.0, you immediately get this build error:

"The Errno GCC 5 patch only goes back as far as v5.6. You will have to generate your own patch to go farther back."

It turns out that building very old Perls isn't quite as easy as it looks.

So, there are a couple sources of data for patching the official Perl releases, to allow them to be built using more modern tools:

And there are a couple of tools that build a Perl release:

Getting back to the original question of the "Errno GCC 5 patch":