Library not loaded: /usr/local/lib/libpq.5.4.dylib

Question

I am working on a rails app.
Installed Postgresql using postgresql-9.1.2-1-osx.dmg
Installed pg gem.
Then when I executed rake db:create getting the

Answer 1

this is not a direct answer to the question but can arise frequently

Two additional cases that might be of interest if you have upgraded PostgreSQL with homebrew:

1. you have proceeded in the past to some pruning of gem versions
2. your application is older and cannot take a recent version of pg (I have a rails 2 app failing with pg 0.17 and nearly killing the server: the mkmr.log increases exponentially ...try 200GB! )

you may actually have numerous versions of pg to rely upon

when you run

gem uninstall pg

if you have more than one version, the system will ask which version you wish to delete. But that list may be useful to you! As an alternative to awenkhh's answer you may stop there and reset your gems to an acceptable version