Finding sphinxbase

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Hello, I am very new to ROS so please excuse me if this is a completely silly question.

I am trying to compile a package given to me by someone. I have an initialized ros_ws folder with the package in the src subdirectory. I type "catkin_make" and get the following error:

 -- checking for module 'sphinxbase'
 --   package 'sphinxbase' not found CMake Error at /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:283
(message):
   A required package was not found Call Stack (most recent call first):  
 /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:337 (_pkg_check_modules_internal)  
 sphinx_mcl/CMakeLists.txt:8 (pkg_check_modules)

Here's the first few lines of the CMakeLists.txt

cmake_minimum_required(VERSION 2.8.3) project(sphinx_mcl)

find_package(PkgConfig)
find_package(catkin REQUIRED COMPONENTS   roscpp )
pkg_check_modules(SPHINX REQUIRED sphinxbase)
pkg_check_modules(POCKETSPHINX REQUIRED pocketsphinx)

It finds pocketsphinx o.k. and I've installed (practically) every Ubuntu package I can think of with the name sphinx in it.

Any ideas?