This is a set of scripts to make it easier to cross-compile transmission for iOS and package it (mainly to use in Apple TV 2nd gen, but also works on iPod/iPhone/iPad as well).

If you want to compile transmission yourself, check sections Compiling and Installation.
If you just want transmission running, you have two faster options:

• install it through Cydia/nikoTV/apt-get as the package is online in the BigBoss repository.

  if you're nikoTV-less apple tv 2g, simply do:

    ssh root@YOUR_APPLETV_IP
    apt-get update
    apt-get install cc.fopina.transmission
  

• Download the .deb file and check the Installation section.

Using the terminal (assuming you have a working installation of XCode and git):
clone this repository

git clone [email protected]:fopina/transmission-ios.git

compile transmission and dependencies

cd transmission-ios
./build.sh

create the deb file

./create_deb.sh

copy it to jailbroken AppleTV 2G (or any other iOS device)

scp transmission-VERSION.deb root@YOUR_DEVICE_IP

install it in the device

ssh root@YOUR_DEVICE_IP
dpkg -i transmission-VERSION.deb

It's done. The post installation script has set up transmission to run on boot and started it as well, so you can go straight ahead and connect to http://YOUR_DEVICE_IP:9091/ for the transmission WebUI.
Personally, regarding Apple TV usage, I like to install the XBMC Transmission plugin as well.

Transmission - A Fast, Easy and Free BitTorrent Client