Error installing Laser scan tools for ROS

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I am trying to install Laser scan tools from git clone https://github.com/ccny-ros-pkg/scan_... , on Hydro. Every time I try to run Catkin_make, I get an error:

[ 41%] Performing configure step for 'csm_src'
-- Create a file named 'local_config/local-brent-Dell-DM051.cmake' if you want to add options.
gsl home: 
DBG GSL_CONFIG GSL_CONFIG-NOTFOUND
FATAL_ERROR,FindGSL.cmake: gsl-config not found. Please set it manually. GSL_CONFIG=GSL_CONFIG-NOTFOUND
CMake Error at sm/CMakeLists.txt:30 (MESSAGE):
  GSL not found.


-- Configuring incomplete, errors occurred!
make[2]: *** [scan_tools/laser_scan_matcher/csm/stamp/csm_src-configure] Error 1
make[1]: *** [scan_tools/laser_scan_matcher/CMakeFiles/csm_src.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
Linking CXX executable /home/brent/catkin_ws/devel/lib/ncd_parser/ncd_parser
[ 41%] Built target ncd_parser
make: *** [all] Error 2
Invoking "make" failed

I am not sure what I am doing wrong.

Thanks for your help.