在 OSX 上安装 Mysql2 时出错

Question

正在尝试安装特定版本的 Mysql2 Gem。我明白了：

sudo gem install mysql2 -v '0.3.20'
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
    ERROR: Failed to build gem native extension.

    /usr/local/var/rbenv/versions/2.2.3/bin/ruby -r ./siteconf20161017-56699-1dsu6v9.rb 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()... no
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
-----
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/mysql/5.7.16/lib
-----
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.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

作为参考，我事先运行了brew install mysql，它运行成功。我还尝试卸载所有版本的brew 的mysql 引用以防万一。

我有什么遗漏吗？我环顾四周，大多数页面都指向确保您运行 brew install mysql，我有。

如果我对上述解释不太清楚，我遇到的失败是在成功运行brew install mysql 之后，错误是因为之后尝试通过gem install mysql2 -v '0.3.20' 安装 gem

有什么想法吗？ 谢谢

Answer 1

如何让它在 MacOS Mojave 上运行。

确保openssl 已通过 Homebrew 安装在 Mac 上：

brew install openssl

然后按照这种特殊方式安装mysql2 gem：

gem install mysql2 -v 'x.x.x' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include

其中 x.x.x - mysql2 gem 的指定版本。

Answer 2

仅供参考，最终工作的是xcode-select --install，它似乎安装了处理ld: library not found for -lssl问题的OpenSSL库。