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I tried every solution similar to the question:错误：安装mysql2时出错：错误：无法构建gem本机扩展。在Mac 10.12
近日，笔者从Ubuntu的到Mac感动，我试图安装在塞拉利昂mysql的宝石和我已经安装了Ruby，Rails的，Mysql的后
也是我型brew install mysql和它的工作了下载MySQL但不是宝石，所以我的问题是不相似的。
我打这个mysql --version
和我mysql Ver 14.14 Distrib 5.7.16, for osx10.12 (x86_64) using EditLine wrapper
我试图安装mysql2创业板轨道建设一个新的应用程序
我打这个sudo gem install mysql2和得到这个错误：
Password:
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
current directory: /Users/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysql2-0.4.5/ext/mysql2
/Users/mohammed.elias/.rbenv/versions/2.4.0/bin/ruby -r ./siteconf20170102-2045-18gcs95.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
checking for rb_big_cmp()... yes
-----
Using mysql_config at /usr/local/bin/mysql_config
-----
checking for mysql.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 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/mysql/5.7.16/lib
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creating Makefile
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/Users/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0-static/mysql2-0.4.5/mkmf.log
current directory: /Users/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysql2-0.4.5/ext/mysql2
make "DESTDIR=" clean
current directory: /Users/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysql2-0.4.5/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/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysq l2-0.4.5 for inspection.
Results logged to /Users/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0-static/mysql2-0.4.5/gem_make.out
[错误安装mysql2：无法构建gem原生扩展名]（http://stackoverflow.com/questions/3608287/error-installing-mysql2-failed-to-build-gem-native-extension） – Ilya
从跟踪中，我们可以看到构建系统找到了mysql头文件，但是无法加载ssl文件（来自OpenSSL）。你可以尝试一下[在github上的问题]（https://github.com/brianmario/mysql2/issues/795）提供的解决方案。如果失败了，你可能会通过运行'brew install openssl'来成功。 –
为了什么是值得的，我刚刚成功安装了gem，全新安装了Ruby 2.4.0。错误日志里有什么'/Users/mohammed.elias/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0-static/mysql2-0.4。 5/mkmf.log'？ – cobaltsoda