On 3 September 2018 at 12:59, Daniel P. Berrangé <berra...@redhat.com> wrote:

>>  ##########################################
>> +# check for usable bpf system call
>> +if test "$bpf" = "yes"; then
>
> if test "x$bpf" != "xno"; then

We don't use the leading-x thingy elsewhere in configure,
why is this condition special?
(We can assume we don't have a broken shell, and we
know that $bpf won't be a string starting with a hyphen.)

thanks
-- PMM

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