what version of linux, libc and gcc are you using? Did you run the program as root (it needs root for ioperm() to enable user space I/O access)? Do you have a chance to add "-g" to your compile parameters and run gdb ./fa_select? (Then do a "run eth0 0" and record the result of "bt").
Anyways, I placed a binary (needs glibc 2.1) on http://www.gxsnmp.org/fa_select
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