I would like to direct you to the following Website if you want pre-compiled SDL2 libraries, header files and DLLs for i686 type system. The binaries were built by St. Lawrence College (Cornwall Campus) Game Development staff. They were built to be used in labs for 2nd semester Game Development students. Included is a wizard for Code:Blocks 10.05 to allow simple configuration of SDL2 (and SDL and even SDL1.3). Samples are available for SDL2_image and SDL2_ttf.
http://www.slctech.org/~mackay/game20212/MingW_SDL2_Binaries.html
(actually all libraries that we use are included in the package simplifying deployment for students and budding programmers)
Good Luck,
Gordon MacKay
Coordinator/Professor
Game Development Technician Program
St. Lawrence College (Cornwall Campus)
Cornwall, Ontario
@gmackay