When I try to run bundle (bundle install), I all the time get


    Installing pg (0.13.2) with native extensions 
    Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
    
            /Users/ryan/.rvm/rubies/ruby-1.9.2-p290/bin/ruby 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&#39;t find the &#39;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.
    
    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/ryan/.rvm/rubies/ruby-1.9.2-p290/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
    	--without-pg-config
    	--with-pg_config
    	--without-pg_config
    
    
    Gem files will remain installed in /Users/ryan/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.13.2 for inspection.
    Results logged to /Users/ryan/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.13.2/ext/gem_make.out
    An error occured while installing pg (0.13.2), and Bundler cannot continue.
    Make sure that `gem install pg -v &#39;0.13.2&#39;` succeeds before bundling.

I use Mac OS X 10.6, the version of installed PostgreSQL is 9.1. I found the problem is in the **libpq-dev**, how could I install/fix that?

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Rails 3 - can't install pg gem