Here\'s a piece of my current Makefile:
CFLAGS = -O2 -Wall -pedantic -std=gnu++11 `sdl-config --cflags --libs` -lSDL_mixer
I have libsdl instal
Having a similar case and I couldn't use StackAttacks solution as he's referring to SDL2 which is for the legacy code I'm using too new.
Fortunately our friends from askUbuntu had something similar:
Download SDL
tar xvf SDL-1.2.tar.gz cd SDL-1.2 ./configure make sudo make install