This is "plugin" for CCTools https://play.google.com/store/apps/details?id=com.pdaxrom.cctools and will not work without CCTools. Update CCTools to the latest version! This "plugin" includes external headers, libraries and examples for SDL2 libraries:
SDL2
SDL2_image
SDL2_mixer
SDL2_net
SDL2_ttf
Run it once after installation for install development files. Run CCTools and try included examples (CCTools/Examples/SDL on internal SD card). Use Makefile from example directories to build and run SDL applications: make utility commands - all, run, log, clean.
all (or empty arg) - to build
run - run it
log - check application log
clean - clean sources, remove binary files
Please commit your problems to issues page http://code.google.com/p/cctools/issues/list