How to use gpiod_line_set_flags

[andy pugh <bodgesoc@xxxxxxxxx>]

I am somewhat puzzled by an error report when I try to use the
function ‘gpiod_line_set_flags’

 warning: implicit declaration of function ‘gpiod_line_set_flags’

Many other function calls in the same code are working just fine.
gpiod_line_set_flags() appears as a function declaration in the header
file looking just like the ones that do work (as far as I can tell)

At the moment I have the code commented out, but I was hoping to be
able to use the flags to control pull-up and pull-down.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912