error building hedgewars

~/Desktop/hw-master> cmake .
CMake Warning at cmake_modules/revinfo.cmake:31 (message):
  /boot/home/Desktop/hw-master/share/version_info.txt not found, revision
  information will be incorrect!!! Contact your source provider to fix this!
Call Stack (most recent call first):
  CMakeLists.txt:48 (include)


-- Building 0.9.20-r0000 (unknown)
-- Using RELEASE configuration
CMake Error at /boot/system/data/cmake/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
  Could NOT find SDL2 (missing: SDL2_LIBRARY SDL2_INCLUDE_DIR)
Call Stack (most recent call first):
  /boot/system/data/cmake/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
  cmake_modules/FindSDL2.cmake:163 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  cmake_modules/FindSDL1or2.cmake:4 (find_package)
  misc/libphyslayer/CMakeLists.txt:2 (find_package)


-- Configuring incomplete, errors occurred!