Question

我尝试在OSX上的heroku上的rails上安装ruby，我使用了this tutorial。它似乎在终端上安装得很好，但是在做完之后

$rails new myapp --database=postgresql
cd myapp

我做了这个

rails generate controller welcome

并收到错误：

Could not find gem 'spring (>= 0) ruby' in the gems available on this machine. Run捆绑安装to install missing gems.

按照说明操作后，我得到了

'An error occurred while installing pg (0.17.1), and Bundler cannot continue.
Make sure that `gem install pg -v '0.17.1'` succeeds before bundling.'

然后......

ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

        ...
Can't find the 'libpq-fe.h header
*** 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.

一个类似的SO问题说通过更新XCode解决了问题，但我不认为这是我的问题。如果它还不明显，我对终端或ruby不太熟悉，所以我不确定如何处理这个问题。

编辑：

新错误消息

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

    /Users/mahireusufzai/.rbenv/versions/2.1.1/bin/ruby extconf.rb 
checking for pg_config... yes
Using config values from /usr/local/bin/pg_config
*** 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.

...

/Users/mahireusufzai/.rbenv/versions/2.1.1/lib/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /Users/mahireusufzai/.rbenv/versions/2.1.1/lib/ruby/2.1.0/mkmf.rb:541:in `try_link0'
    from /Users/mahireusufzai/.rbenv/versions/2.1.1/lib/ruby/2.1.0/mkmf.rb:556:in `try_link'
    from extconf.rb:39:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /Users/mahireusufzai/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/pg-0.17.1 for inspection.

Answer 1

您需要先安装postgresql开发库。它抱怨libpq-fe.h丢失了。

根据以下帖子中的答案尝试解决：Rails: Error installing pg gem

Answer 2

尝试

yum install postgresql-devel

或

brew install postgresql

然后gem install pg应该有效

在Heroku - Rails中安装gem'pg'的问题

2 个答案: