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macOS High Sierra(OSX)のOpenSSLをデフォルトのLibreSSLからOpenSSLに変更する

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MacのHigh Sierraから、デフォルトのOpenSSLがOpenSSLからLibreSSLになっているそうで、OpenSSLの諸々の問題を鑑みれば英断らしいのですが、そうはいっても開発環境の様々なツールがOpenSSLに依存しておりアレコレと新たな問題を引き起こすため、様々なツールのほうがLibreSSLに対応するまでさくっとOpenSSLに出戻る方法が下記です。

使用されているSSLをみる

$ openssl version
LibreSSL 2.2.7

やっぱりOpenSSLじゃない。

HomebrewでOpenSSLをインストール

$ brew install openssl

インストールしたOpenSSLの詳細をみる。

$ brew info openssl
openssl: stable 1.0.2o (bottled) [keg-only]
SSL/TLS cryptography library
https://openssl.org/
/usr/local/Cellar/openssl/1.0.2o_1 (1,791 files, 12.3MB)
  Poured from bottle on 2018-05-08 at 15:22:23
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/openssl.rb
==> Dependencies
Build: makedepend ✘
==> Options
--without-test
    Skip build-time tests (not recommended)
==> Caveats
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

This formula is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/openssl/lib
    CPPFLAGS: -I/usr/local/opt/openssl/include

If you need to have this software first in your PATH run:
(意訳:もしあなたがこのソフトウェアを優先したい場合は実行)

地味に悩んだのにすべてここに書かれていた……。

$ echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

ターミナルを再起動してできあがり。

$ openssl version
OpenSSL 1.0.2o  27 Mar 2018
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