I strongly believe that line:80 of fldsp.cpp should be
blksz = sys_getblksize(); // is this guaranteed to be the same as
sys_getblksize() ?
instead of
blksz = sp[0]->s_n; // is this guaranteed to be the same as
sys_getblksize() ?
which answers also the question in the comment.
OTHERWISE: Crash during DspSetup() (for me atleast)