gpsfake 3.1 with gpsd 3.12 fails

[mjuenema]

+ GPSD_HOME=/opt/gpsd/3.12/sbin
+ python2.7 /opt/gpsd/3.1/bin/gpsfake -c 0.1 -n tests/short.nmea
Processing tests/short.nmea
usage: gpsd [-b] [-n] [-N] [-D n] [-F sockfile] [-G] [-P pidfile] [-S port] [-h] device...
  Options include: 
  -b                    = bluetooth-safe: open data sources read-only
  -n                = don't wait for client connects to poll GPS
  -N                = don't go into background
  -F sockfile           = specify control socket location
  -G                    = make gpsd listen on INADDR_ANY
  -P pidfile                = set file to record process ID 
  -D integer (default 0)    = set debug level 
  -S integer (default 2947) = set port for daemon 
  -h                    = help message 
  -V                = emit version and exit.
A device may be a local serial device for GPS input, or a URL in one 
of the following forms:
     tcp://host[:port]
     udp://host[:port]
     {dgpsip|ntrip}://[user:passwd@]host[:port][/stream]
     gpsd://host[:port][/device][?protocol]
in which case it specifies an input source for device, DGPS or ntrip data.

The following driver types are compiled into this gpsd instance:
# n: mode switch, b: speed switch, c: rate switch, *: non-NMEA packet type.
# Shared memory export enabled.