gem 安装 postgre 错误 - Mac 10.10

Question

大家好，我正在尝试在我的 macOS 上安装 postgre：Yosemite 10.10.2

首先，我这样做是因为我试图在不支持 sqlite 的 Heroku 上部署我的应用程序，所以我做了以下操作：

group :development, :test do
  gem 'sqlite3'
  gem 'sqlite3-ruby', :require => 'sqlite3'
end

group :production do
  gem 'pg'
end

所以当我在 heroku 上部署它时它工作正常。

但现在我不能再运行 'bundle install' 因为它说我使用了命令：

sudo gem install pg --
--with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config
--with-pg-include='/Applications/Postgres.app/Contents/Versions/9.3/include/'
-–with-pg-lib=/usr/lib

（我之前也分别试过每一个）

这是我得到的：

sudo gem install pg -- 
--with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config  
--with-pg-include='/Applications/Postgres.app/Contents/Versions/9.3/include/' 
–with-pg-lib=/usr/lib
Building native extensions with: '--with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config --with-pg-include=/Applications/Postgres.app/Contents/Versions/9.3/include/ –with-pg-lib=/usr/lib'
This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby -r ./siteconf20150208-28855-hgneo3.rb extconf.rb --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config --with-pg-include=/Applications/Postgres.app/Contents/Versions/9.3/include/ –with-pg-lib=/usr/lib
Using config values from /Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config
checking for libpq-fe.h... yes
checking for libpq/libpq-fs.h... yes
checking for pg_config_manual.h... yes
checking for PQconnectdb() in -lpq... no
checking for PQconnectdb() in -llibpq... no
checking for PQconnectdb() in -lms/libpq... no
Can't find the PostgreSQL client library (libpq)

*** 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.
   extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/pg-0.18.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-14/2.0.0/pg-0.18.1/gem_make.out

我不明白为什么他不能得到 PQconnectdb() ？我在这里遗漏了什么吗？

提前致谢=)

Answer 1

虽然你在本地电脑上基本不用"production"环境，但是你还是需要在你的电脑上安装postgres才能正常使用。根据您的日志，您似乎没有正确安装 postgres。

我推荐使用homebrew安装：

brew install postgres

在通过自制软件安装 postgres 后安装 pg gem 时不应出现此错误。

如果您使用其他方法安装它，您可能需要在安装 pg gem 时添加一些参数。以下是一些参考资料：

Installing PostgreSQL gem under Ubuntu and Mac

Can't find the PostgreSQL client library (libpq)

gem 安装 postgre 错误 - Mac 10.10

gem install postgre error - Mac 10.10

pg

ruby-on-rails-3

ruby-on-rails-4

osx-yosemite