Search:

I'm sure there is a FAQ at libsdl.org to explain all of this.

Did you also set the name of the library that the linker should use as well?

Somewhere in say project->settings->compiler, there is an option to
- add additional paths to search for include files (DONE)
- add additional paths to search for libraries (TO DO)
- add...

Somewhere in say project->settings->compiler, there is an option to
- add additional paths to search for include files
- add additional paths to search for libraries
- add additional library...

Well you need to download the library and header files for a start.
Simple DirectMedia Layer