Fixed bug 2136 and 2624, include directives are wrong for tremor and modplug on Debian
Fixed bug 2690 - Floating point exception in Mix_Volume()

Francisco de la Peña

This happens rarely under uncertain circunstances, as it doesn't crash always and does it randomly. Fortunately, I've got a backtrace when running a GDB session. Might be a divide by zero issue in SDL or SDL_mixer.

Program received signal SIGFPE, Arithmetic exception.
0x00000038e8c08a7d in mix_channels (udata=<optimized out>, stream=0x24e11b0 "", len=2048) at mixer.c:345
345	                        Mix_Volume(i, (mix_channel[i].fade_volume * ticks) / mix_channel[i].fade_length );
(gdb) bt f
#0  0x00000038e8c08a7d in mix_channels (udata=<optimized out>, stream=0x24e11b0 "", len=2048) at mixer.c:345
        ticks = 0
        mix_input = <optimized out>
        i = 0
        mixable = <optimized out>
        volume = <optimized out>
        sdl_ticks = 129373

Using SDL 2.0.3 and SDL_Mixer 2.0.0, PulseAudio, Fedora 20 x86_64 but looks like can be reproduced on other platforms.