http://simutrans-germany.com/stn/data/compile.log.gcc4.txt
http://simutrans-germany.com/~nightly/simutrans/en.html
Looks like there is midi related problem which prevented linux build from being compiled, maybe since r5602.
I haven't tried to compile it myself.
Adding
#include "../simdebug.h"
to music/sdl_midi.cc should fix
thanks, corrected in r5618
Thanks :)