sample code at https://people.eecs.berkeley.edu/~bh/logo-sample.html
behaves a bit strangely but it's the same with the in-tree version but
simple tests with pen control/movement work as well as before.
(the distfile for 5.5 is no longer available upstream, port had no
MASTER_SITES line so was using implicit default of MASTER_SITE_OPENBSD)