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Fix problems with pg gem on mac os and the postgres App

The problem

I was getting the following error on rails server:

 Library not loaded: /usr/lib/libpq.5.dylib (LoadError)
  Referenced from: /Users/messutiEdd/.rvm/gems/ruby-1.9.3-p362/gems/pg-0.14.1/lib/pg_ext.bundle
  Reason: image not found - /Users/messutiEdd/.rvm/gems/ruby-1.9.3-p362/gems/pg-0.14.1/lib/pg_ext.bundle

The solution

First find pg_config file

find / -name pg_config

Then install the pg gem using that file

gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config

source

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