安装 nio4r (1.2.1) 时出错，Bundler 无法继续答案

【问题标题】：An error occurred while installing nio4r (1.2.1), and Bundler cannot continue安装 nio4r (1.2.1) 时出错，Bundler 无法继续
【发布时间】：2017-02-09 18:34:27
【问题描述】：

您好，我正在努力将我的网站放到数字海洋中。但是在我捆绑安装的过程中，我得到了这个错误

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /usr/local/rvm/rubies/ruby-2.2.4/bin/ruby -r ./siteconf20161001-6508-ukh5t9.rb extconf.rb --with-cflags=-std=c99
checking for unistd.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/local/rvm/rubies/ruby-2.2.4/bin/$(RUBY_BASE_NAME)
/usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:587:in `try_cpp'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:1060:in `block in have_header'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:911:in `block in checking_for'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:351:in `block (2 levels) in postpone'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:321:in `open'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:351:in `block in postpone'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:321:in `open'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:347:in `postpone'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:910:in `checking_for'
        from /usr/local/rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:1059:in `have_header'
        from extconf.rb:3:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /usr/local/rvm/gems/ruby-2.2.4/gems/nio4r-1.2.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-2.2.4/extensions/x86_64-linux/2.2.0/nio4r-1.2.1/gem_make.out

An error occurred while installing nio4r (1.2.1), and Bundler cannot continue.
Make sure that `gem install nio4r -v '1.2.1'` succeeds before bundling.

我正在使用Putty.exe按照教程https://www.digitalocean.com/community/tutorials/how-to-use-the-ruby-on-rails-one-click-application-on-digitalocean进行配置

我正在使用 Ruby ruby 2.2.4p230 导轨 5.0.0.1

不确定这是否有帮助。当我使用 Putty.exe 配置我的网站时，教程说如果您的 Gemfile 指定的 Ruby 版本与系统上安装的版本不同，您可以使用 RVM 安装它。所以我尝试了：

rvm install 2.2.4
rvm use ruby-2.2.4-p230 --default

但我收到错误 ruby-2.2.4-p230 未安装。并且无法安装，因为系统找不到特定的版本。所以我用

 rvm use ruby-2.2.4

【问题讨论】：

试试：sudo apt-get install build-essential.
你解决了这个问题吗，因为我在 windows 上遇到了这个问题

标签： ruby-on-rails ruby digital-ocean

【解决方案1】：

sudo apt-get install build-essential

为我工作

【讨论】：