Comment 1 for bug 1008692

Assuming you are following the wiki install instructions, If you are running from a 12.04 Core install then you need to do the following:
(Again assuming from wiki that your ubuntu-tv is in ~/ubutu-tv)

cd ~/ubuntu-tv
nano CMakeLists.txt
press ctrl+w and find "unity-core-4.0" replace with "unity-core-5.0"
ctrl+x, y, enter
cmake .

You may/will also run into issues with nux-core-1.0 + a few other while building nux-core-2.0;

cd ~
bzr branch lp:~unity-team/nux/trunk nux
cd ~/nux
apt-get install libpci-dev libibus-1.0-dev
./autogen.sh
make
cd ~/ubuntu-tv
nano CMakeLists.txt
ctrl+w find "nux-core-1.0" replace with "nux-core-2.0"
ctrl+x, y, enter
cmake .
make