system_lib not found when catkin_make the simple_voice package

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I git clone https://github.com/DinnerHowe/simple_... which is a package shared by baidu and used for ROS speech.I also install the python-pyaudio and vlc-python module which were needed by this package.When the package was catkin, it reported the warnning that is "catkin_package() DEPENDS on 'system_lib' but neither 'system_lib_INCLUDE_DIRS' nor 'system_lib_LIBRARIES' is defined." .I browse the CMakeLists.txt of the package and delete the line "DEPENDS system_lib" and catkin_make it,it was catkin_make successfully but I can't roscd the package.Can you tell me what the DEPENDS system_lib is and how to solve this problem?Thank you very much!