macos - ld : library not found for -lssl while installing mysql2 gem

Question

我将项目 Gemfile 中的 mysql2 版本从 0.3.20 更改为 0.5.2。当我运行 bundle update mysql2 时，出现以下错误:

Fetching mysql2 0.5.2 (was 0.3.21)
Installing mysql2 0.5.2 (was 0.3.21) with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/hirurg103/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql2-0.5.2/ext/mysql2
/Users/hirurg103/.rbenv/versions/2.4.1/bin/ruby -I /Users/hirurg103/.rbenv/versions/2.4.1/lib/ruby/site_ruby/2.4.0 -r ./siteconf20190715-35076-13r30uh.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/opt/mysql@5.6/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... no
checking for MYSQL_OPT_SSL_ENFORCE in mysql.h... no
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... 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/opt/mysql@5.6/lib
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creating Makefile

current directory: /Users/hirurg103/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql2-0.5.2/ext/mysql2
make "DESTDIR=" clean

current directory: /Users/hirurg103/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/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/hirurg103/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql2-0.5.2 for inspection.
Results logged to /Users/hirurg103/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-18/2.4.0-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.

我的设置:

mysql:Ver 14.14 Distrib 5.6.42，适用于 osx10.14 (x86_64)，使用 EditLine 包装器

操作系统:MacOS Mojave 10.14.2

如何修复此错误？

Answer 1

我能够使用以下命令解决此问题:

gem install mysql2 -v '0.5.2' -- --with-cflags=\"-I/usr/local/opt/openssl/include\" --with-ldflags=\"-L/usr/local/opt/openssl/lib\"

然后

bundle install

更新:

OpenSSL 1.0 reached EOL on 2019-12-31 。 Mac OS 和 Homebrew 软件包升级后，您需要指定 openssl@1.1 的路径:

gem install mysql2 -v 0.5.2 -- --with-cflags=\"-I/usr/local/opt/openssl@1.1/include\" --with-ldflags=\"-L/usr/local/opt/openssl@1.1/lib\"