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【macOS Catalina】rbenvで古いバージョンのrubyがインストール出来ない問題を解決

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問題

rbenvで2.2.2のrubyをインストール出来ない。

実行環境

OS: macOS Catalina
Version: 10.15.4
brew version: Homebrew 2.2.13
rbenv: stable 1.1.2

エラーログ

$ rbenv install 2.2.2

...

The Ruby openssl extension was not compiled.
ERROR: Ruby install aborted due to missing extensions
Configure options used:
  --prefix=/Users/user_name/.rbenv/versions/2.2.2
  --with-openssl-dir=/usr/local/opt/openssl@1.1
  --with-readline-dir=/usr/local/opt/readline
  CC=clang
  LDFLAGS=-L/Users/user_name/.rbenv/versions/2.2.2/lib
  CPPFLAGS=-I/Users/user_name/.rbenv/versions/2.2.2/include

解決方法

$ brew install rbenv/tap/openssl@1.0
$ RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.0)" rbenv install 2.2.2

解説

本問題はrbenvがruby-buildを用いてrubyをインストールしており、以下のリンクの Ruby < 2.4 is not compatible with OpenSSL 1.1. の内容の通り、openssl@1.0 をrbenv用にインストールして指定してあげないといけない。

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