ext: systems missing libiconv will see a relevant error message #2505
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What problem is this PR intended to solve?
Fixes #2487
systems missing libiconv will see a relevant error message instead of a syntax error from extconf.rb
Have you included adequate test coverage?
I have only reproduced the issue on OpenBSD systems, for which we do not have test coverage today. If someone familiar with OpenBSD and Github Actions would like to submit a PR to do so, I would consider it.
Does this change affect the behavior of either the C or the Java implementations?
No behavioral changes.