无法在 Ubuntu 20.04 上为 Ruby 版本 2.5.3 安装 json 版本 1.8.2 gem答案

【问题标题】：Unable to install json version 1.8.2 gem for Ruby version 2.5.3 on Ubuntu 20.04无法在 Ubuntu 20.04 上为 Ruby 版本 2.5.3 安装 json 版本 1.8.2 gem
【发布时间】：2023-03-02 23:21:02
【问题描述】：

我正在尝试运行 rails 服务器，当我运行 bundle install 命令时，我收到以下错误：

An error occurred while installing json (1.8.3), and Bundler cannot
continue.
Make sure that `gem install json -v '1.8.3' --source 'https://rubygems.org/'`
succeeds before bundling.

当我运行推荐的命令 gem install gem install json -v '1.8.3' --source 'https://rubygems.org/' 时，我在构建原生扩展时出错

Building native extensions. This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

    current directory: /home/user/.rvm/gems/ruby-2.5.3/gems/json-1.8.3/ext/json/ext/generator
/home/user/.rvm/rubies/ruby-2.5.3/bin/ruby -I /home/user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0 -r ./siteconf20210822-103903-1kc2ys9.rb extconf.rb
creating Makefile

current directory: /home/user/.rvm/gems/ruby-2.5.3/gems/json-1.8.3/ext/json/ext/generator
make "DESTDIR=" clean

current directory: /home/user/.rvm/gems/ruby-2.5.3/gems/json-1.8.3/ext/json/ext/generator
make "DESTDIR="
compiling generator.c
generator.c: In function ‘generate_json’:
generator.c:861:25: error: ‘rb_cFixnum’ undeclared (first use in this function); did you mean ‘mFixnum’?
  861 |     } else if (klass == rb_cFixnum) {
      |                         ^~~~~~~~~~
      |                         mFixnum
generator.c:861:25: note: each undeclared identifier is reported only once for each function it appears in
generator.c:863:25: error: ‘rb_cBignum’ undeclared (first use in this function); did you mean ‘mBignum’?
  863 |     } else if (klass == rb_cBignum) {
      |                         ^~~~~~~~~~
      |                         mBignum
generator.c: At top level:
cc1: warning: unrecognized command line option ‘-Wno-self-assign’
cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
make: *** [Makefile:242: generator.o] Error 1

make failed, exit code 2

我不知道我该如何解决这个问题，任何帮助将不胜感激

【问题讨论】：

标签： ruby-on-rails ruby ruby-on-rails-3 rubygems bundler

【解决方案1】：

您正在尝试从 2015 年开始安装 very old version of gem json。

这个 gem 依赖于一些 ruby 标头，例如 Bignum，这些标头已在最新版本的 ruby 中被删除。

尝试安装此 gem 的更新版本，例如：

gem install json -v '2.5.1' --source 'https://rubygems.org/'

或者，您可以尝试downgrade your ruby version to 2.3.0，并尝试在1.8.3上安装json版本。

【讨论】：