For most users of NS2, it would be easier if they can use a popular IDE to work with the files.
Here are the step by step instructions I followed to set up NS-2.34 with Eclipse 3.5 in Ubuntu Linux.

In older versions of Eclipse, the settings might be slightly different.

I have compiled the following steps after running into various problems and errors with the setup, and solving them all. So I hope the setup will be smooth for you.

Setting up Eclipse

Installing NS-2

Adding NS-2 as a Project in Eclipse

Setting Debug Configuration

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