Problem

When you issue npm install pg command to instal pg package for Node on your Mac OS X, you might get an error like this

        "...error: The program ['pg_config'] is required"

Error simply implies that pg installation cannot find pg_config file.

Solution

1. First make sure you installed PostgreSQL.
2. Find the path to your pg_config file. In my case it is /Library/PostreSQL/8.4/bin/pg_config
3. Open the Terminal and enter the following commands one by one    
    
    PG_CONFIG=/Library/PostreSQL/8.4/bin/pg_config
    export PG_CONFIG
    npm install pg

Syncing your iPhone contacts might get ugly if you do not know how to do it or you use an app that is not well tailored for your needs. In this tutorial I'm going to show you how to sync your Gmail contacts (with groups) with your iPhone. Let's get started.

First, you need to backup your contacts from your Gamil account. To do that, go to Contacts and hit More tab and you will see a dropdown list. Choose Export and export your contacts as Google CSV format. If everything goes wrong you can bring all your contacts back from this backup. Besides you can save this file to your backup drive for another use.

After backing up your contacts go to Settings/ Mail,Contacts, Calender on your iPhone and delete all the mail accounts before synchronization. You need to do it since synchronizing works best this way. Othervise you will end up with duplicate contacts or other unwanted behavior.

Next step is to install the required app. It is called Contacts EXtreme by POPo's Innovation Ltd. It was a free app when I installed it.

When the installation is complete run Contacts EXtreme, hit More tab, scroll down and choose Clear iPhone Contacts. Later, choose Clear Local Sync Data (probably you don't need to do this if this is your first use; however, clearing local sync data won't give any damage).

As a final step scroll up and choose Sync with Gmail Contacts. That's it.

All these steps worked for me. If they do not work you please leave a comment and I'll try to help you.