[ruby-core:119290] [Ruby master Bug#20760] Ruby 3.0.6 fails to build on macOS 15.0 24A335 arm64

Issue #20760 has been reported by jschoolcraft (Jeff Schoolcraft).

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Bug #20760: Ruby 3.0.6 fails to build on macOS 15.0 24A335 arm64
https://bugs.ruby-lang.org/issues/20760

* Author: jschoolcraft (Jeff Schoolcraft)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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I support a Rails 6.1 project with Ruby 3.0.6 and am unable to build 3.0.6 on a new mac book pro running macOS 15.0 24A335 arm64.

I've attached the build log the primary failure is related to `maybe_unused` in BigDecimal.

I tried multiple workarounds suggested in:

* https://github.com/rvm/rvm/issues/5365
* https://www.reddit.com/r/ruby/comments/yjvn5c/ruby_30_on_m1_failing_because_of_bigdecimal/
* https://bugs.ruby-lang.org/issues/18912#note-6
* https://github.com/rbenv/ruby-build/discussions/2185

I'm able to install 3.0.6 on macOS 14.6.1 23G93 arm64 with only these changes:

```
brew install rbenv/tap/openssl@1.0
asdf install ruby 3.0.6 --with-openssl-dir="$(brew --prefix)/opt/openssl@1.0"
```

---Files--------------------------------
ruby-build.20240924112240.30103.log (71.6 KB)


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