A north pole map like so works fine and adds the desired labels every 60 deg
pscoast -Dc -W1 -R0/360/35/90 -JA0/90/6 -Ba60 > tmp.ps
However, if I do
pscoast -Dc -W1 -R0/360/-90/-35 -JA0/-90/6 -Ba60 > tmp.ps
for a south pole map, there are no annotations. What am I missing?
Thanks!
(6.4.0_9c89f6a_2022.03.26 from github a few minutes ago)