18 Mar
2019
18 Mar
'19
1:05 p.m.
which indicates that those values aren't available UNLESS your program has defines matching the first line shown. I haven't bothered to check for the value of _POSIX_C_SOURCE in the absence of commandline options that change the GCC default behavior, but just defining _GNU_SOURCE is enough to make it compile:
Thanks Fred,
That worked.
Jerry