從同學那裡拿來乙個rails專案工程的原始碼，發現gemfile中rails版本是3.2.11，和我安裝的不一樣，於是執行bundle update rails ，報錯如下：
installing pg 0.14.1 with native extensions
gem::ext::builderror: error: failed to build gem native extension.
/home/zkp/.rvm/rubies/ruby-1.9.3-p551/bin/ruby -r ./siteconf20150912-4116-1fwu6vx.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. check the mkmf.log file for more
details. you may need configuration options.
在網上查詢解決辦法，
需要執行sudo apt-get install libpq-dev
執行後問題解決，安裝完成。
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