Error gem install pg with on Mac Yosemite

Question

I was trying to use postgresql with Ruby on Rails

However, I type gem install pg , it comes with an error

Provided configuration options:
    --with-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/Coda/.rvm/rubies/ruby-2.1.3/bin/ruby
    --with-pg
    --without-pg
    --enable-windows-cross
    --disable-windows-cross
    --with-pg-config
    --without-pg-config
    --with-pg_config
    --without-pg_config
    --with-pg-dir
    --without-pg-dir
    --with-pg-include
    --without-pg-include=${pg-dir}/include
    --with-pg-lib
    --without-pg-lib=${pg-dir}/lib

extconf failed, exit code 1

Gem files will remain installed in /Users/Coda/.rvm/gems/ruby-2.1.3@rails416/gems/pg-0.18.2 for inspection.
Results logged to /Users/Coda/.rvm/gems/ruby-2.1.3@rails416/extensions/x86_64-darwin-13/2.1.0/pg-0.18.2/gem_make.out

Environment: Mac OSX 10.10

rails version: Rails 4.1.8

ruby version: ruby 2.1.3

Answer 1

First,I downloaded and and installed Postgres.app at here , then set the right Path

export PATH=$PATH:/Applications/Postgres.app/Contents/Versions/9.4/bin

Final, retype the command

gem install pg