hi, this 11k lines of fortran compile and run under Linux, on FreeBSD 5.4, compiling with f77 produces a binary, apparently without errors, but executing it, inmediately gives 'Abort', ldd gives signal 6 ktrace is not very helpful :-) 36372 ktrace RET ktrace 0 36372 ktrace CALL execve(0xbfbfea0f,0xbfbfe914,0xbfbfe91c) 36372 ktrace NAMI "./xm99" any ideas? danny