pluginlib build fails: Unknown CMake command "catkin_add_gtest".

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What am I missing that would cause this error? For background, I'm attempting to build the velodyne stack from source, because I may need to run the debugger in the future. I have built ros-fuerte from source and installed in /opt/ros/fuerte. I use rosws, roslocate, and rosmake to build stuff from source.

Update: Here's how I built ros-fuerte:

sudo pip install -U rosinstall
rosinstall --catkin ~/ros-underlay http://ros.org/rosinstalls/fuerte-ros-full.rosinstall
cd ~/ros-underlay
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=/opt/ros/fuerte -DSETUPTOOLS_DEB_LAYOUT=OFF
cd ..
make -j8
sudo make install

That's pretty much what the ros wiki describes. I've left out installing necessary dependencies, of course. Running rosversion ros gives me 1.8.9.