CMake error in hector_navigation or navigation

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Hi! I'm using a RPi2 with Ubuntu and ROS Indigo (desktop). I am trying to install hector_navigation:

cd catkin_ws/src
git clone https://github.com/tu-darmstadt-ros-pkg/hector_navigation.git
catkin_make

but at this point I get this error message:

CMake Error at /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:75 (find_package):
Could not find a package configuration file provided by "pcl_conversions"
with any of the following names:

pcl_conversionsConfig.cmake
pcl_conversions-config.cmake

Add the installation prefix of "pcl_conversions" to CMAKE_PREFIX_PATH or
set "pcl_conversions_DIR" to a directory containing one of the above files.
If "pcl_conversions" provides a separate development package or SDK, be
sure it has been installed.
Call Stack (most recent call first):
hector_navigation/hector_costmap/CMakeLists.txt:7 (find_package)

-- Configuring incomplete, errors occurred!
See also "/home/ubuntu/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ubuntu/catkin_ws/build/CMakeFiles/CMakeError.log".
Invoking "cmake" failed

I had got the same problem too by installing navigation from https://github.com/ros-planning/navig... . How do I fix? Thank you!