无法在 iOS 10.10.5 上安装 pg 0.18.2

Question

我卸载了 0.18.1 版本，现在我无法安装任何版本。我想安装 0.18.2 我是运行这个命令：

gem install pg -v '0.18.2'
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

    /Users/liviu-mac/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150901-1693-1wdi2b8.rb 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 ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.

不知道如何修复安装？

Answer 1

我使用了错误的路径，在我的例子中正确的命令是：

gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config

我用的是 9.3 而不是 9.4

无法在 iOS 10.10.5 上安装 pg 0.18.2

Failed to install pg 0.18.2 on iOS 10.10.5

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