pi gets crazzy about gmt HOT 2 CLOSED

It is a feature: We only do fractional pi up to <= 2 pi. From the comments:
/* We only allow n pi, 1.5pi, and fractions 3/4, 2/3, 1/2, 1/3, and 1/4. */

The idea was to keep it simple, but if you want 5pi, 16 pi/3, 17 pi/3, 6pi, etc then we need to recode that section.

from gmt.

It was the first time I used it and even then it was on Julia test. Now I see (better) that the man says for an optional integer n and optional m fractions 2, 3, or 4. but very easy to not see it. Not sure what it should do. Possibly a warning and only print (n)pi's after 2pi

from gmt.