安装pg gem时出错

Question

我在尝试安装'pg'时遇到以下错误有何想法？ 我对rails很新，所以我不知道如何解决这个问题。

Davids-MacBook-Air:~ DavidStevenson$ install pg
usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 file2
       install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 ... fileN directory
       install -d [-v] [-g group] [-m mode] [-o owner] directory ...
Davids-MacBook-Air:~ DavidStevenson$ gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

    /usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby extconf.rb


make
compiling gvl_wrappers.c
compiling pg.c
pg.c: In function ‘Init_pg_ext’:
pg.c:384: error: ‘PQPING_OK’ undeclared (first use in this function)
pg.c:384: error: (Each undeclared identifier is reported only once
pg.c:384: error: for each function it appears in.)
pg.c:386: error: ‘PQPING_REJECT’ undeclared (first use in this function)
pg.c:388: error: ‘PQPING_NO_RESPONSE’ undeclared (first use in this function)
pg.c:390: error: ‘PQPING_NO_ATTEMPT’ undeclared (first use in this function)
make: *** [pg.o] Error 1


Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1     for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1/ext/gem_make.out

Answer 1

您可能需要首先安装postgresql开发库，使用（homebrew，macports，fink）之一。 我个人仍然喜欢macports，但自制软件似乎越来越受欢迎。 如果仍然无效，您可能需要将一些标志传递给'gem install'命令，告诉它在哪里找到这些库。

Answer 2

请在Mac上尝试以下链接安装postgres：

如何为mac os x安装postgresql

在Mac Lion上安装Postgresql