Spring RTS Engine

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CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
SDL_INCLUDE_DIR
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Wrappers
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Wrappers/Cpp
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Wrappers/CUtils
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Wrappers/LegacyCpp
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Interfaces
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Interfaces/Java
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Interfaces/C
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/NullOOJavaAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/NullAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/CppTestAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/E323AI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/KAIK
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/RAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/NullJavaAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/AAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/AI/Skirmish/HughAI
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/tools/unitsync
   used as include directory in directory /home/awrapp/Downloads/spring_0.81.1.3/tools/DemoTool

-- Configuring incomplete, errors occurred!