I've just upgraded from 11.4 to 11.10 and at least one thing seems to be broken: I have a C++ program that is using SDL and OpenGL. I was able to compile and run it just fine before the upgrade. Now I get linker errors, for example

undefined reference to `SDL_Init'

I have libsdl1.2debian and libsdl1.2-dev packages installed, I believe that is all I need (but I might be wrong). I compile the program like this:

gcc -I /usr/include/SDL -lSDL -o test test.cpp

Any idea what can be causing this?