Fetching mysql2 0.3.20
Installing mysql2 0.3.20 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /Users/stan/.rvm/rubies/ruby-2.1.2/bin/ruby extconf.rb
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... 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 mysqld_error.h... yes
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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/percona-server/5.7.22-22/lib
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creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling infile.c
compiling client.c
compiling mysql2_ext.c
compiling result.c
linking shared-object mysql2/mysql2.bundle
ld: warning: directory not found for option '-L/Users/travis/.sm/pkg/active/lib'
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/stan/.rvm/gems/ruby-2.1.2/gems/mysql2-0.3.20 for inspection.
Results logged to
/Users/stan/.rvm/gems/ruby-2.1.2/extensions/x86_64-darwin-13/2.1.0-static/mysql2-0.3.20/gem_make.out

An error occurred while installing mysql2 (0.3.20), and Bundler cannot
continue.
Make sure that `gem install mysql2 -v '0.3.20'` succeeds before bundling.

xcode-select --install