function detectNumCPUs () {
    if sysctl -n "hw.ncpu" 2>/dev/null; then
        # This works for most BSDs.
        :
    elif grep -qF processor /proc/cpuinfo 2>/dev/null; then
        # Linux sucks...
        grep -cF processor /proc/cpuinfo
    else
        echo -n "WARNING: $0 doesn't know how to detect the number of" >&2
        echo -n "processors on this platform. Assuming we have just one..." >&2
        echo 1
    fi
}