Macでbundle installでMYSQL2のエラーが出たときの対処法

script.sh

$ # see also https://qiita.com/fukuda_fu/items/463a39406ce713396403
$ brew info openssl
openssl@1.1: stable 1.1.1g (bottled) [keg-only]
Cryptography and SSL/TLS Toolkit
https://openssl.org/
/usr/local/Cellar/openssl@1.1/1.1.1g (8,059 files, 18MB)
  Poured from bottle on 2020-06-08 at 09:27:05
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/openssl@1.1.rb
==> Caveats
A CA file has been bootstrapped using certificates from the system
keychain. To add additional certificates, place .pem files in
  /usr/local/etc/openssl@1.1/certs

and run
  /usr/local/opt/openssl@1.1/bin/c_rehash

openssl@1.1 is keg-only, which means it was not symlinked into /usr/local,
because macOS provides LibreSSL.

If you need to have openssl@1.1 first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"' >> /Users/katsuya/.bash_profile

For compilers to find openssl@1.1 you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include"

For pkg-config to find openssl@1.1 you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/openssl@1.1/lib/pkgconfig"

==> Analytics
install: 603,803 (30 days), 2,355,683 (90 days), 6,203,501 (365 days)
install-on-request: 76,527 (30 days), 350,885 (90 days), 822,688 (365 days)
build-error: 0 (30 days)
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl@1.1/lib"
$ bundle config --local build.mysql2 "--with-cppflags=-I/usr/local/opt/openssl@1.1/include"