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Found the problem: it was finding the wrong version of Python. Arch linux defaults to python 3 so tricks have to be used to get it use 2.7 for ROS. The arch linux ros install wiki gives a function I added to my .bashrc to setup the environment

# ROS
hydro() {
  source /opt/ros/hydro/setup.bash
  export ROS_PACKAGE_PATH=/path/to/your/your/package/path:$ROS_PACKAGE_PATH
  export PYTHONPATH=/opt/ros/hydro/lib/python2.7/site-packages:$PYTHONPATH
  export PKG_CONFIG_PATH="/opt/ros/hydro/lib/pkgconfig:$PKG_CONFIG_PATH"
  alias python=/usr/bin/python2

  # Gazebo
  source /usr/share/gazebo/setup.sh
}

But in the case of catkin_make that apparently isn't enough. I found that I also need to pass all the options in to catkin_make, i.e.

catkin_make -DPYTHON_EXECUTABLE=/usr/bin/python2 -DPYTHON_INCLUDE_DIR=/usr/include/python2.7 -DPYTHON_LIBRARY=/usr/lib/libpython2.7.so