hi Tihomir, > fluxa/src/SearchPaths.o: In function `__exchange_and_add': > /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../../include/c++/4.4.0/ext/atomicity.h:46: > undefined reference to `__sync_fetch_and_add_4' i'm just guessing, but try to add -march=i686 to the CCFLAGS in the SConstruct file. best, gabor