This guide is based almost entirely on the work of pmcallihan as posted in the Tonido User Forums.

This guide will walk you through preparing a development environment on your TonidoPlug 2 so that you can compile and install packages from their source code. These instructions will provide access to the debian-multimedia repository, upgrade the software to the latest debian-squeeze and install a full software build system.

1. SSH into the TonidoPlug as root.

2. Go to the root directory

 cd /

3. Make a working directory called src. We will work from here and stay away from the app directory on root. It’s important.

 mkdir src
 cd /src

4. Open the apt sources.list file with nano.

 nano /etc/apt/sources.list
 

5. Add the debian squeeze multimedia repository to the sources list. Paste the following line at the end of the list:

 deb http://www.deb-multimedia.org squeeze main non-free  

The complete file should look like this:

 deb http://ftp.us.debian.org/debian/ squeeze main contrib non-free
 deb http://security.debian.org/ squeeze/updates main contrib non-free
 deb http://www.deb-multimedia.org squeeze main non-free 

6. Save and close the sources.list file.

CRTL-o
ENTER
CRTL-x

7. Update the local package database.

 apt-get update

8. Install repository key for the debian-multimedia repository.

 apt-get install deb-multimedia-keyring

9. Upgrade the system to the most current packages.

 apt-get upgrade

10. Install a complete build system.

  apt-get install build-essential automake autoconf libtool pkg-config intltool

That’s it. You are ready to build packages.

Source: http://www.tonido.com/forum/viewtopic.php?f=37&t=3625