Ruby on rails 安装pg gem时出错

我在尝试安装“pg”时遇到以下错误有什么想法吗？我是rails的新手，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

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您可能需要首先使用（homebrew、macports、fink）之一安装postgresql开发库。我个人仍然喜欢macports，但自制软件似乎越来越受欢迎。如果仍然不起作用，您可能需要向“gem install”命令传递一些标志，告诉它在哪里可以找到这些库。

请尝试在Mac上安装postgres的以下链接：

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如果我的答案对您有效，您介意将其标记为已接受吗？