ruby-on-rails - 无法安装特定的 gem

Question

我有一个现有的Ruby On Rails项目，我正在尝试启动并运行它，但是当我尝试迁移数据库时，它说：

$ rake db:migrate 

Could not find json-1.6.5 in any of the sources

然后，当我尝试安装特定的gem时，它将失败！

$ gem install json -v '1.6.5'

Fetching: json-1.6.5.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing json:
        ERROR: Failed to build gem native extension.

        /Users/dev/.rvm/rubies/ruby-1.9.2-p136/bin/ruby extconf.rb
creating Makefile

make
sh: make: command not found


Gem files will remain installed in /Users/dev/.rvm/gems/ruby-1.9.2-p136@rails3/gems/json-1.6.5 for inspection.
Results logged to /Users/dev/.rvm/gems/ruby-1.9.2-p136@rails3/gems/json-1.6.5/ext/json/ext/parser/gem_make.out

Answer 1

看来您缺少某些命令行工具。

验证您已安装

$ whereis make

应该返回如下内容：

/usr/bin/make

和

$ make -v

应该类似于：

GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i386-apple-darwin11.0

如果您没有看到类似的内容，也许您应该查看这篇文章 https://stackoverflow.com/a/10217910/335523