[violateland][cmake] SDLIMAGE_LIBRARY?

Вобщем все делаю по README.
после запуска cmake -DCMAKE_INSTALL_PREFIX=/usr/local/violatland/ ..
Мне сообщают:
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:
SDLIMAGE_INCLUDE_DIR
used as include directory in directory /src/game/violetland/violetland-v0.2.0
SDLIMAGE_LIBRARY
linked by target "violetland" in directory /src/game/violetland/violetland-v0.2.0
SDLMIXER_INCLUDE_DIR
used as include directory in directory /src/game/violetland/violetland-v0.2.0
SDLMIXER_LIBRARY
linked by target "violetland" in directory /src/game/violetland/violetland-v0.2.0
SDLTTF_INCLUDE_DIR
used as include directory in directory /src/game/violetland/violetland-v0.2.0
SDLTTF_LIBRARY
linked by target "violetland" in directory /src/game/violetland/violetland-v0.2.0

-- Configuring incomplete, errors occurred!

Кто нибудь может подсказать, в чем дело?
Нагуглить ничего толкового не получилось.
С CMake не знаком вообще.