ld：安装时找不到 -lssl 的库 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 我得到以下错误：

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

OS：MacOS Mojave 10.14.2

我该如何解决这个错误？

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 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\"

Answer 2

我已经修复了安装缺少的包 libssl-dev（在 Debian 衍生版上）。

Answer 3

在 macOS Big Sur 上，我使用以下命令安装 mysql2 gem：

brew install openssl
gem install mysql2 -v '0.5.3' -- --with-ldflags=-L/usr/local/opt/openssl/lib

Answer 4

Homebrew 移动了文件，这是 2022 年 4 月现在可以使用的：

Macbook Arm M1
MacOS 蒙特雷 12.3.1
自制软件 3.4.7

gem install mysql2 -v '0.5.3' -- \
--with-cflags=\"-I/opt/homebrew/opt/openssl/include\" \
--with-ldflags=\"-L/opt/homebrew/opt/openssl/lib\"

ld：安装时找不到 -lssl 的库 mysql2 gem

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

macos

failed-installation

mysql2

macos-mojave