I’m trying to test
Plots on Travis and I get this:
GKS: can't open display on "" Is your DISPLAY environment variable set correctly? Did you enable X11 and TCP forwarding? GKS: Open failed in routine OPEN_WS GKS: GKS not in proper state. GKS must be either in the state WSOP or WSAC in routine ACTIVATE_WS
followed by a segmentation fault.
Any idea how to remedy this?