无法在 Ubuntu 16.04 Xenial 中安装 gems "mysql2, mariadb 10.1"

Question

我有工作的mariadb 10.1服务器。我在 ubuntu 2.3.0 上安装 ruby 16.04。我安装了libmariadbd-dev和libmariadbclient-dev。当我尝试"gem install mysql2"时，会收到一条消息：

Building native extensions with: '--with-mysql-dir=/usr/local/mysql'
This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.
    current directory: /var/lib/gems/2.3.0/gems/mysql2-0.4.4/ext/mysql2
/usr/bin/ruby2.3 -r ./siteconf20160615-5183-kj9yds.rb extconf.rb --with-mysql-dir=/usr/local/mysql
checking for ruby/thread.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.
Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/bin/$(RUBY_BASE_NAME)2.3
/usr/lib/ruby/2.3.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from /usr/lib/ruby/2.3.0/mkmf.rb:587:in `try_cpp'
        from /usr/lib/ruby/2.3.0/mkmf.rb:1091:in `block in have_header'
        from /usr/lib/ruby/2.3.0/mkmf.rb:942:in `block in checking_for'
        from /usr/lib/ruby/2.3.0/mkmf.rb:350:in `block (2 levels) in postpone'
        from /usr/lib/ruby/2.3.0/mkmf.rb:320:in `open'
        from /usr/lib/ruby/2.3.0/mkmf.rb:350:in `block in postpone'
        from /usr/lib/ruby/2.3.0/mkmf.rb:320:in `open'
        from /usr/lib/ruby/2.3.0/mkmf.rb:346:in `postpone'
        from /usr/lib/ruby/2.3.0/mkmf.rb:941:in `checking_for'
        from /usr/lib/ruby/2.3.0/mkmf.rb:1090:in `have_header'
        from extconf.rb:16:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
  /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/mysql2-0.4.4/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.3.0/gems/mysql2-0.4.4 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/mysql2-0.4.4/gem_make.out

而且我找不到如何建造这个宝石。

Answer 1

在这种情况下，

Gem 需要 3 个数据包。

sudo apt-get install libnetcdf-dev libssl-dev libcrypto++-dev

Answer 2

这适用于 mac，但您需要更改路径：

gem uninstall mysql2

Inall MariaDB 10.1 和 necesaary SSL 软件包，或者也许不需要这个然后检查库的路径，并且 tinal 文件夹具有相同的名称：

bundle config --local build.mysql2 "--with-mysql-config=/usr/local/Cellar/mariadb@10.1/10.1.29/bin/mysql_config --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"

或没有 SSL 路径

bundle config --local build.mysql2 "--with-mysql-config=/usr/local/Cellar/mariadb@10.1/10.1.29/bin/mysql_config

或者直接使用gem，但是如果您来自mysql，则最好使用捆绑包来执行此操作

gem install mysql2 -v 'x.y.z' -- --with-mysql-config=/usr/local/Cellar/mariadb@10.1/10.1.29/bin/mysql_config

最后

bundle install