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brew upgradeでエラーが出たので対応した.

# brew upgradeでエラーが出たので対応した.

$ brew upgrade
==> Downloading https://homebrew.bintray.com/bottles-portable/portable-ruby-2.3.3.leopard_64.bottle.1.tar.gz
Already downloaded: /PATH/TO/Caches/Homebrew/portable-ruby-2.3.3.leopard_64.bottle.1.tar.gz
/usr/local/Homebrew/Library/Homebrew/cmd/vendor-install.sh: /usr/local/bin/shasum: /usr/local/bin/perl: bad interpreter: No such file or directory
Error: Checksum mismatch.
Expected: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Actual:
Archive: /Users/You/Library/Caches/Homebrew/portable-ruby-2.3.3.leopard_64.bottle.1.tar.gz
To retry an incomplete download, remove the file above.
Error: Failed to install vendor Ruby.

$ which -a perl
/usr/bin/perl
/PATH/to/.plenv/shims/perl

$ ln -s /usr/bin/perl /usr/local/bin/perl

$ which -a perl
/usr/local/bin/perl
/usr/bin/perl
/PATH/to/.plenv/shims/perl

$ brew upgrade