gazebo_ros_pkgs build error on saucy/indigo

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I'm trying to build gazebo_ros_pkgs on saucy/indigo, and I'm getting the following build error:

[ 14%] [ 15%] Generating dynamic reconfigure files from cfg/GazeboRosCamera.cfg: /home/scpeters/ws/gazebo_ros_pkgs/devel/include/gazebo_plugins/GazeboRosCameraConfig.h /home/scpeters/ws/gazebo_ros_pkgs/devel/lib/python2.7/dist-packages/gazebo_plugins/cfg/GazeboRosCameraConfig.py
Generating dynamic reconfigure files from cfg/Hokuyo.cfg: /home/scpeters/ws/gazebo_ros_pkgs/devel/include/gazebo_plugins/HokuyoConfig.h /home/scpeters/ws/gazebo_ros_pkgs/devel/lib/python2.7/dist-packages/gazebo_plugins/cfg/HokuyoConfig.py
[ 15%] Generating dynamic reconfigure files from cfg/GazeboRosOpenniKinect.cfg: /home/scpeters/ws/gazebo_ros_pkgs/devel/include/gazebo_plugins/GazeboRosOpenniKinectConfig.h /home/scpeters/ws/gazebo_ros_pkgs/devel/lib/python2.7/dist-packages/gazebo_plugins/cfg/GazeboRosOpenniKinectConfig.py
...
Traceback (most recent call last):
  File "/home/scpeters/ws/gazebo_ros_pkgs/src/gazebo_ros_pkgs/gazebo_plugins/cfg/Hokuyo.cfg", line 41, in <module>
    from driver_base.msg import SensorLevels
ImportError: No module named msg
Traceback (most recent call last):
  File "/home/scpeters/ws/gazebo_ros_pkgs/src/gazebo_ros_pkgs/gazebo_plugins/cfg/GazeboRosCamera.cfg", line 6, in <module>
    from driver_base.msg import SensorLevels
ImportError: No module named msg
Traceback (most recent call last):
make[2]: *** [/home/scpeters/ws/gazebo_ros_pkgs/devel/include/gazebo_plugins/HokuyoConfig.h] Error 1  File "/home/scpeters/ws/gazebo_ros_pkgs/src/gazebo_ros_pkgs/gazebo_plugins/cfg/GazeboRosOpenniKinect.cfg", line 6, in <module>

    from driver_base.msg import SensorLevels
make[2]: *** Waiting for unfinished jobs....
ImportError: No module named msg
make[2]: *** [/home/scpeters/ws/gazebo_ros_pkgs/devel/include/gazebo_plugins/GazeboRosCameraConfig.h] Error 1
[ 16%] [ 20%] make[2]: *** [/home/scpeters/ws/gazebo_ros_pkgs/devel/include/gazebo_plugins/GazeboRosOpenniKinectConfig.h] Error 1
[ 23%] [ 28%] make[1]: *** [gazebo_ros_pkgs/gazebo_plugins/CMakeFiles/gazebo_plugins_gencfg.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Any ideas? I've cross-posted to the gazebo_ros_pkgs issue tracker.