See URL. It doesn't fail on glibc systems because _GNU_SOURCE makes it redefine _POSIX_C_SOURCE to a correct value but defining it empty is definitely broken. Upstream patch following.
Created attachment 179574 [details, diff] upstream fix please backport that fix in portage, thanks.
looks ok.
(In reply to comment #2) > looks ok. does that mean "feel free to apply" or "someone in the gnome team will apply it" ?
@aballier in most case it would mean go ahead for a fellow dev.
fixed without a bump, thanks for the patch and report.