High Sierraにアップデートしたらbundle installでこけた話

久しぶりにRuby周りやろうとして、bundle install でライブラリを取得しようとしたときに、また依存関係でこけたので対応した話です。
MacでのRubyあるあるですw

nokogiriのインストールでエラー

checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using system libraries.
ERROR: cannot discover where libxml2 is located on your system. please make sure `pkg-config` is installed.
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/Users/tatsunorinishikori/.anyenv/envs/rbenv/versions/2.2.2/bin/$(RUBY_BASE_NAME)
        --help
        --clean
        --use-system-libraries
        --with-zlib-dir
        --without-zlib-dir
        --with-zlib-include
        --without-zlib-include=${zlib-dir}/include
        --with-zlib-lib
        --without-zlib-lib=${zlib-dir}/lib
        --with-xml2-dir
        --without-xml2-dir
        --with-xml2-include
        --without-xml2-include=${xml2-dir}/include
        --with-xml2-lib
        --without-xml2-lib=${xml2-dir}/lib
        --with-libxml-2.0-config
        --without-libxml-2.0-config
        --with-pkg-config
        --without-pkg-config
        --with-xslt-dir
        --without-xslt-dir
        --with-xslt-include
        --without-xslt-include=${xslt-dir}/include
        --with-xslt-lib
        --without-xslt-lib=${xslt-dir}/lib
        --with-libxslt-config
        --without-libxslt-config
        --with-exslt-dir
        --without-exslt-dir
        --with-exslt-include
        --without-exslt-include=${exslt-dir}/include
        --with-exslt-lib
        --without-exslt-lib=${exslt-dir}/lib
        --with-libexslt-config
        --without-libexslt-config

extconf failed, exit code 1

Gem files will remain installed in /Users/tatsunorinishikori/workspace/ruby/sample-devise/vendor/bundle/ruby/2.2.0/gems/nokogiri-1.8.0 for inspection.
Results logged to /Users/tatsunorinishikori/workspace/ruby/sample-devise/vendor/bundle/ruby/2.2.0/extensions/x86_64-darwin-16/2.2.0-static/nokogiri-1.8.0/gem_make.out

An error occurred while installing nokogiri (1.8.0), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.8.0'` succeeds before bundling.

cannot discover where libxml2 is located on your system.と怒られる。。。

ls -la /usr/local/lib/ | grep libxml2

どうやら、libxml2のsymlinkが消えているので、再度リンクし直す

brew link --force libxml2

これでnokogiriのエラーは解消し、インストールに成功しました。

mysql2のインストールでエラー

result.c:326:40: warning: incompatible pointer types assigning to 'my_bool *' (aka 'char *') from 'bool *' [-Wincompatible-pointer-types]
    wrapper->result_buffers[i].is_null = &wrapper->is_null[i];
                                       ^ ~~~~~~~~~~~~~~~~~~~~
result.c:328:40: warning: incompatible pointer types assigning to 'my_bool *' (aka 'char *') from 'bool *' [-Wincompatible-pointer-types]
    wrapper->result_buffers[i].error   = &wrapper->error[i];
                                       ^ ~~~~~~~~~~~~~~~~~~
2 warnings generated.
linking shared-object mysql2/mysql2.bundle
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1

make failed, exit code 2

openssl周りっぽい感じのエラーが出ている。。。

Xcode Command Line Toolをアップデートしてみることに