Postgresql Gem 未安装答案

【问题标题】：Postgresql Gem Not InstallingPostgresql Gem 未安装
【发布时间】：2014-04-07 07:34:25
【问题描述】：

我一直在尝试运行 bundle install，但出现以下错误：

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/fr/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***

按照说明，我收到以下错误：

gem install pg -v '0.17.0'                                                    ⏎
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

    /Users/fr/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***

我按照之前报告的类似问题中提供的说明进行操作。请看Installing PG gem - failure to build native extension

但这并没有帮助，如下所示：

brew install postgresql
Warning: Could not link postgresql. Unlinking...
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
You can try again using `brew link postgresql'

Possible conflicting files are:
==> /usr/local/Cellar/postgresql/9.3.4/bin/initdb /usr/local/var/postgres
==> Summary
????  /usr/local/Cellar/postgresql/9.3.4: 2928 files, 38M


brew link postgresql
Linking /usr/local/Cellar/postgresql/9.3.4...
Warning: Could not link postgresql. Unlinking...
Error: Could not symlink file: /usr/local/Cellar/postgresql/9.3.4/share/man/man7/WITH.7
/usr/local/share/man/man7 is not writable. You should change its permissions.

我的两个担忧是：

如何解决与“pg”gem 相关的问题？
要解决此问题，是否需要修改 brew link postgresql 输出中提到的文件的读写权限？

【问题讨论】：

之前已经回答过多次：stackoverflow.com/questions/13086073/…stackoverflow.com/questions/6040583/…
请查看链接stackoverflow.com/a/18864397/2518860
检查权限：ls -ld /usr/local/Cellar 并打开它们进行写入：sudo chmod a+w /usr/local/Cellar 并尝试再次安装brew install postgresql
嗨@Monk_Code，我尝试了你的建议。检查目录后，我看到了以下输出：ls -ld /usr/local/Cellar drwxrwxrwx 21 fr wheel 714 Apr 7 10:49 /usr/local/Cellar 在尝试brew install postgresql 时，我看到了以下输出：Linking /usr/local/Cellar/postgresql/9.3.4... Warning: Could not link postgresql. Unlinking... Error: Could not symlink file: /usr/local/Cellar/postgresql/9.3.4/share/man/man7/WITH.7 /usr/local/share/man/man7 is not writable. You should change its permissions.
大家好，我设法解决了这个问题。主要问题是 pg 版本 - 0.17.0。我安装了最新的 Postgres.app 并在安装时验证了版本是 0.17.1。然后我将 gem 文件修改为简单的 gem 'pg' 并运行 bundle update。感谢大家的建议和链接。

标签： ruby-on-rails ruby postgresql homebrew

【解决方案1】：

我设法解决了这个问题。主要问题是 pg 版本 - 0.17.0。我安装了最新的 Postgres.app 并在安装时验证了版本是 0.17.1。然后我将 gem 文件修改为简单的 gem 'pg' 并运行包更新。感谢大家的建议和链接。

【讨论】：