sudo gem install pg 不起作用
我正在尝试让 Rails 与 PostgreSQL 一起工作。显然，我一路上需要做的一件事是 sudo gem install pg 。当我这样做时，我得到了这个：
jason@buster:~/projects$ sudo gem install pg
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.8 extconf.rb
extconf.rb:2:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:2
Gem files will remain installed in /var/lib/gems/1.8/gems/pg-0.10.0 for inspection.
Results logged to /var/lib/gems/1.8/gems/pg-0.10.0/ext/gem_make.out
我已经用谷歌搜索并根据我发现的内容尝试了一些东西，但似乎没有任何帮助。有什么建议吗？我在Ubuntu上。
I'm trying to get Rails to work with PostgreSQL. Apparently one thing I need to do along the way is sudo gem install pg. When I do that, I get this:
jason@buster:~/projects$ sudo gem install pg
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.8 extconf.rb
extconf.rb:2:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:2
Gem files will remain installed in /var/lib/gems/1.8/gems/pg-0.10.0 for inspection.
Results logged to /var/lib/gems/1.8/gems/pg-0.10.0/ext/gem_make.out
I've Googled and tried a few things based on what I've found but nothing seems to help. Any advice? I'm on Ubuntu.
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您需要安装发行版 ruby-dev（或 devel）包，否则您将无法构建任何 ruby C 扩展。
我不在 ubuntu，但你的包管理器命令可能有点像这样：
You need to install your distro ruby-dev (or devel) package otherwise you won~t be able to build any ruby C extensions.
I'm not on ubuntu, but you package-manager command might be somewhat like this:
在Ubuntu上：
On Ubuntu: