i've tried with ldd:
Code:
nicola@mother:~$ ldd /usr/games/chromium
        libglpng.so.1 => /usr/lib/libglpng.so.1 (0x40028000)
        libGL.so.1 => /usr/X11R6/lib/libGL.so.1 (0x4002c000)
        libGLU.so.1 => /usr/X11R6/lib/libGLU.so.1 (0x4009c000)
        libopenal.so.0 => /usr/lib/libopenal.so.0 (0x40117000)
        libdl.so.2 => /lib/tls/libdl.so.2 (0x401a9000)
        libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x401ac000)
        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x40253000)
        libsmpeg-0.4.so.0 => /usr/lib/libsmpeg-0.4.so.0 (0x40262000)
        [CUT]

nicola@mother:~$ ldd /usr/games/tuxracer
        libdl.so.2 => /lib/tls/libdl.so.2 (0x4018d000)
        libtcl8.4.so.0 => /usr/lib/libtcl8.4.so.0 (0x40191000)
        libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x40241000)
        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x402e8000)
        libSDL_mixer-1.2.so.0 => /usr/lib/libSDL_mixer-1.2.so.0 (0x402f7000)
        libGL.so.1 => /usr/X11R6/lib/libGL.so.1 (0x4033e000)
        libGLU.so.1 => /usr/X11R6/lib/libGLU.so.1 (0x403ad000)
        [CUT]
They all link to libSDL-1,2.so.0