Can't find the 'libpq-fe.h header when trying to install pg gem

Question

I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:

Answer 1

On CentOS,I installed libpq-dev package using below command

yum install postgresql-devel

Executing gem install pg returned the same error as "No pg_config... trying anyway. If building fails, please try again with --with-pg-config=/path/to/pg_config".

Installing the gem as below solved my problem

gem install pg -- --with-pg-config=/usr/pgsql-x.x/bin/pg_config