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我已经通过谷歌和Stackoverflow，并且尚未解决我安装将程序部署到Heroku所需的pg gem的问题。如何知道使用哪些配置选项在OSX上安装pg gem？
我已经通过Macport安装Postgresql，但也许我安装它在错误的路径下？
我说，因为我收到follwing当我这样做gem install pg -- --with-pg-config=/user/local/bin/pg_config：
extconf.rb:24:in ``': No such file or directory - /users/******/postgresql/bin/pg_config --includedir (Errno::ENOENT)
还是我没有做一个完整的安装，因为我不断获取此：
*** 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.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/TonyNg/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
--with-pg
--without-pg
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib
--with-pg-config
应该如何我着手解决这个问题？