mysql2 version 0.5.2 Installation Failed [duplicate] - ruby

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Error when trying to install app with mysql2 gem
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Closed 4 years ago.
I am trying to install mysql2 (version 0.5.2) on My MacBook running OSX 10.14.1 and using Rails 5.2.2. I have already installed it using gem install mysql2 but it wasn't successful, yet it's in my gem file as:
gem 'mysql2'
When I try installing gem mysql2, I am getting the following error:
Fetching mysql2 0.5.2
Installing mysql2 0.5.2 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2- 0.5.2/ext/mysql2
/Users/lawrence/.rbenv/versions/2.5.3/bin/ruby -r ./siteconf20181213-11829- 1fv4si0.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_wait_for_single_fd()... yes
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Using mysql_config at /usr/local/bin/mysql_config
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checking for mysql.h... yes
checking for errmsg.h... yes
checking for SSL_MODE_DISABLED in mysql.h... yes
checking for SSL_MODE_PREFERRED in mysql.h... yes
checking for SSL_MODE_REQUIRED in mysql.h... yes
checking for SSL_MODE_VERIFY_CA in mysql.h... yes
checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... yes
checking for MYSQL.net.vio in mysql.h... yes
checking for MYSQL.net.pvio in mysql.h... no
checking for MYSQL_ENABLE_CLEARTEXT_PLUGIN in mysql.h... yes
checking for SERVER_QUERY_NO_GOOD_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_NO_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_WAS_SLOW in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_ON in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_OFF in mysql.h... yes
checking for my_bool in mysql.h... no
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Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load
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Setting libpath to /usr/local/Cellar/mysql/8.0.12/lib
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creating Makefile
current directory: /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2- 0.5.2/ext/mysql2
make "DESTDIR=" clean
current directory: /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2-0.5.2/ext/mysql2
make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.c
compiling statement.c
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
Gem files will remain installed in /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2-0.5.2 for inspection.
Results logged to /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/extensions/x86_64- darwin-18/2.5.0-static/mysql2-0.5.2/gem_make.out
An error occurred while installing mysql2 (0.5.2), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/'` succeeds before bundling.
In Gemfile: mysql2
How can I fix this issue?

Answer 1

I have found the Answer
Mojave changed the location of header files necessary for compiling C extensions. You might need to run the following command to install pg, mysql2, nokogiri, or other gems that require C extensions:
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
Follow the link below and find out more.
https://gorails.com/setup/osx/10.14-mojave

Answer 2

ld: library not found for -lssl is the likely culprit.
Try brew install openssl. Also, check out this post for more information.
EDIT: For future users this worked for me facing a similar issue. Make sure you change the -v to whatever version you need. I am on rails 4.2.x so used 0.4.10, Rails 5.x would use 0.5.x.
gem install mysql2 -v '0.4.10' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include